This isn't quite an exact emulation, as instead of using one selection
that is magically in "column mode", we emulate it with a bunch of zed
multi-selections (one per line).

I think this is better, as it requires fewer changes to the codebase,
and lets you see the impact of any changes immediately on all lines.

Fixes: zed-industries/community#984

Co-authored-by: Mikayla <mikayla@zed.dev>

![image](https://github.com/zed-industries/zed/assets/2690773/3aae1e6a-9993-4e65-8ed1-20f2f4b452df)

Allows to use `editor::SelectAll`(`cmd-a` by default) in Terminal to
select all text in it, for future copying.
Currently, does not try to be smart and trim the selected whitespaces
after the last prompt, and copies them too.

Release Notes:

- Support `editor::SelectAll` in Terminal

Going to do these in batches.  Here is the first one.

Release Notes:

- Associated additional file extensions with known languages
(([#633](https://github.com/zed-industries/community/issues/633)),
([#1822](https://github.com/zed-industries/community/issues/1822))).
    - C++: `cxx`, `hxx`, `inl`
    - JavaScript: `cjs`
    - Python: `mpy`
    - TypeScript: `cts`, `d.cts`, `d.mts`, `mts`

Co-authored-by: Mikayla <mikayla@zed.dev>

Co-authored-by: maxbrunsfeld <max@zed.dev>

co-authored-by: Nate <nate@zed.dev>

Instead of trying to extend the Mode::Visual special case, just split
out into three different modes.

Update vim mode to have vim selection and editor selections match.
Before this we had to adjust between vim selections and real selections
when making changes; now we have to adjust when making selections.

Release Notes:

- vim: Ensure editor selection matches the vim selection
([#1796](https://github.com/zed-industries/community/issues/1796)).
- vim: Fix `s` in visual line mode
- vim: Add `o` and `shift-o` to toggle direction of visual selection
- vim: Fix `v` and `shift-v` to toggle back to normal mode
- vim: Fix block selections like `vi}` to contain correct whitespace

Fixes: zed-industries/community#1857

- vim: Fix escape in normal mode
([#1857](https://github.com/zed-industries/community/issues/1857)).

This PR is a continuation of the components UI exploration I've been
doing. It adds an example to the GPUI examples page and totally
restructures the generics on our MouseEventHandler.

Release Note:
- N/A

Re-arrange generics on mouse event handler
Add TypeTag struct for dynamically tagged components

Co-authored-by: Mikayla <mikayla@zed.dev>

Co-authored-by: Mikayla <mikayla@zed.dev>

Co-authored-by: Mikayla <mikayla@zed.dev>

Co-authored-by: Mikayla <mikayla@zed.dev>

Co-authored-by: Mikayla <mikayla@zed.dev>

Fixes: zed-industries/community#1857

Co-Authored-By: Mikayla Maki <mikayla@zed.dev>

Part of
https://linear.app/zed-industries/issue/Z-2750/investigate-performance-of-collaborating-on-large-files-with-inlay

Instead of querying the entire file for hints, query visible editor(s)
range + the areas above and below, of the same height.
Non-invalidating future queries (e.g. scrolling) query only missing
parts of the ranges.

Release Notes:

- Improved LSP resource usage by querying less hints for big files

Part of
https://linear.app/zed-industries/issue/Z-2750/investigate-performance-of-collaborating-on-large-files-with-inlay

* Declares client capabilities for hint resolution, marking both fields
available for resolution (`textEdits` and `tooltop`) as resolvable.
We do not use these fields anymore, hence can omit resolving them for
now, but LSP servers can omit them during general hint requests.

* Removes `tooltip` and replaces complex `label` with its simple string
counterpart for clients' hint responses from host: both should be
resolved through host later

Release Notes:

- Reduces collab mode clients' inlay hint footprint by enabling hint
data resolution

Co-Authored-By: Mikayla Maki <mikayla@zed.dev>

Co-authored-by: Mikayla <mikayla@zed.dev>