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New Modal implementation for gpui2

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This PR makes the `theme_importer` format the themes that it generates
automatically.

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This PR reworks the way we define our third-party themes to make them
work as overlays on top of a base theme.

We introduce the concept of a `UserThemeFamily` that contains
`UserTheme`s. Rather than being an entire theme definition on their own,
a `UserTheme` just contains optional overrides for the values in a
`Theme`.

When resolving a `UserTheme`, we apply it on top of the base theme. Any
values not overridden in the `UserTheme` will fall back to the `Theme`
defaults.

Right now we are just using `UserTheme` to model third-party themes that
we distribute with the Zed binary. However, this same structure can also
be used to import arbitrary user themes (such as from a theme registry,
or even a theme blob from the settings file).

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Co-Authored-By: Piotr Osiewicz <piotr@zed.dev>
Co-Authored-By: Conrad Irwin <conrad@zed.dev>

P.S. this is all completely different now

Co-Authored-By: Marshall <marshall@zed.dev>
Co-Authored-By: Julia <julia@zed.dev>

Ignore this PR for now.

This has a chance to speed up a build in case where e.g. we're
single-threaded in aarch64 build; at that point the x86_64 codegen can
take place. Also, MIR can probably be shared between the two
architectures, further reducing build time.

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- Flesh out gpui2 test support
- Smoke test for event handling

This PR renames the `ThemeVariant` type to `Theme`.

This better reflects its purpose, as well as matches the same name as we
had before, which should make porting crates slightly easier.

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Co-Authored-By: Julia <julia@zed.dev>
Co-Authored-By: Piotr <piotr@zed.dev>

Co-Authored-By: Julia <julia@zed.dev>
Co-Authored-By: Piotr <piotr@zed.dev>

![CleanShot 2023-11-07 at 13 16
28@2x](https://github.com/zed-industries/zed/assets/482957/a136a3d9-b518-4591-8307-e63cfe0e4310)


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Try to use notarytool to fix build problems

[[PR Description]]

Thanks @maxdeviant for all the help with this one 🫂 

- Adds the `theme_importer` crate
- Adds the ability to import themes in VSCode Format.
- Adds the `assets/themes/src` folder with source files for imported
themes
- Adds an initial set of themes: `andromeda`, `ayu`, `dracula`,
`gruvbox`, `night-owl`, `noctis`, `palenight`, `rose-pine`, `solarized`,
`synthwave-84`.

From the README:

## Usage

- `cargo run -p theme_importer` - Import the context of
`assets/themes/src`

---

## Troubleshooting

As the importer generates rust files, you may need to manually do some
cleanup in `registry.rs` and `themes/mod.rs` if you remove themes or
delete the `themes` folder in the theme crate.

---

## Required Structure

To import a theme or series of themes 3 things are required:

- `family.json`: A JSON file containing the theme family metadata and
list of theme variants
- `{theme_name}.json`: One theme json for each theme variant
- `LICENSE`: A license file for the theme family

### `family.json`

#### `name`

The name of the theme family. Avoid special characters.

This will be used for the theme family directory name (lowercased) and
the theme family name in the Zed UI.

Good:

- `Rose Pine`
- `Synthwave 84`
- `Monokai Solarized`

Bad:

- `Rosé Pine`
- `Synthwave '84`
- `Monokai (Solarized)`

#### `author`

The author of the theme family. This can be a name or a username.

This will be used for the theme family author in the Zed UI.

#### `themes`

A list of theme variants.

`appearance` can be either `light` or `dark`. This will impact which
default fallback colors are used, and where the theme shows up in the
Zed UI.

### `{theme_name}.json`

Each theme added to the family must have a corresponding JSON file. This
JSON file can be obtained from the VSCode extensions folder (once you
have installed it.) This is usually located at `~/.vscode/extensions`
(on macOS).

You can use `open ~/.vscode/extensions` to open the folder in Finder
directly.

Copy that json file into the theme family directory and tidy up the
filenames as needed.

### `LICENSE`

A LICENSE file is required to import a theme family. Failing to provide
a complete text license will cause it to be skipped when the import is
run.

If the theme only provices a license code (e.g. MIT, Apache 2.0, etc.)
then put that code into the LICENSE file.

If no license is provided, either contact the theme creator or don't add
the theme.

---

### Complete Example:

An example family with multiple variants:

```json
{
  "name": "Ayu",
  // When both name and username are available
  // prefer the `username (name)` format
  "author": "dempfi (Ike Ku)",
  "themes": [
    {
      "name": "Ayu Light",
      "file_name": "ayu-light.json",
      "appearance": "light"
    },
    {
      "name": "Ayu Mirage",
      "file_name": "ayu-mirage.json",
      "appearance": "dark"
    },
    {
      "name": "Ayu Dark",
      "file_name": "ayu-dark.json",
      "appearance": "dark"
    }
  ]
}
```

An example single variant family:

```json
{
  "name": "Andromeda",
  "author": "Eliver Lara (EliverLara)",
  "themes": [
    {
      "name": "Andromeda",
      "file_name": "andromeda.json",
      "appearance": "dark"
    },
    {
      "name": "Andromeda Bordered",
      "file_name": "andromeda-bordered.json",
      "appearance": "dark"
    }
  ]
}
```


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- Make tab bar visible
- Fix tab text colors
- Ensure panes cover the available space
- Make the close button close
- Fix bug when unsubscribe called after remove
- WIP: start on editor element
- Add hover behaviour to tabs
- Add PointingHand on tabs
- gpui2: Add on_hover events
- Tooltip on tabs
- MOAR TOOLTIPS
- Use an `IconButton` for the tab close button
- Remove unneeded type qualification
- Tooltips in mouse event handler & fix executor timer
- Move more tooltip logic into gpui2 & fix tooltip moving on paint
- Update tooltip code a bit
- Allow multiple subscriptions from one entity handle

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This PR adds interactivity to the `Checkbox` component.

They can now be checked and unchecked by clicking them.

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- Fix executor.timer() in gpui2
- Add support for tooltips 

[[PR Description]]

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Follow-up of https://github.com/zed-industries/zed/pull/3236 that fixes
a bug introduced in that PR: diagnostics warning toggle stopped working.

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