Mitchell Hashimoto 74e1c47623 macOS: Command Palette (#7153)
This introduces a command palette (inspired by @pluiedev's work in
#5681, but not using it as a base) for macOS.

The command palette is available in the `View` menu and also bindable
via `toggle_command_palette`, default binding is `cmd+shift+p` to match
VSCode.

The commands in the command palette must map to a _bindable_ action,
though they may not have an associated keybinding. This means that any
new binding actions we add in the future can be represented here and
also makes it easy in the future to add configuration to add new custom
entries to the command palette. For this initial PR, the available
commands are hardcoded (`src/input/commands.zig`).

I've noticed in other programs (VSCode, Zed), the command palette
contains pretty much _all available actions_ even if they're basically
useless in the context of a command palette. For example, Zed has the
"toggle command palette" action in the command palette and it... does
nothing (it probably should hide the palette). I followed @pluiedev's
lead and made this subjective in this PR but I wonder if we should
actually force all binding actions to be available.

There are various other improvements I'd like to make but omitted from
this PR for the sake of limiting scope:

* Instead of an entry with no matches doing nothing, we can allow users
to manually input _any_ configurable binding.
* Localization, since macOS doesn't have any yet. But for Linux when we
port this we probably have to change our strings extraction.

## Demo


https://github.com/user-attachments/assets/a2155cfb-d86b-4c1a-82b5-74ba927e4d69
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..
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