Co-authored-by: Antonio Scandurra <me@as-cii.com>

Add an API that returns the most active zed users and the projects where they've been active

Highlight files ending in `mdx` as Markdown

This is clearly a stopgap solution but it'll make our life easier
while hacking on zed.dev.

Enhance auto-closing bracket behavior

Replace "Remove Folder from Project" label with "Remove from Project`

Fix project leak in contacts panel

Override `performKeyEquivalent` to handle key events

This lets us bypass the application menu and invoke the event handler
in Zed first. If that doesn't handle the event, the application menu
item corresponding to the shortcut will be actioned. Prior to this
commit the opposite would happen, which would dramatically limit the
throughput at which we could handle events.

Determine `Buffer::is_dirty` based on the rope's fingerprint

This is calculated in `Rope` and uses the `bromberg_sl2` homomorphic
hash function to determine the fingerprint of a single chunk and
compose each chunk fingerprint into a single fingerprint for the entire
rope that is equivalent to hashing all the rope's bytes at once.

Themes in app menu

Disable auto-indent entirely for markdown

Return focus to the workspace center on escape

Toggle search options via the keyboard

Use word boundaries instead of syntax to infer completion edit ranges

Cap context menu's width to cover at most 70% of the window