Display case-sensitive keybindings for vim commands (#24322)

This Pull Request tackles the issue outline in #14287 by changing the
way `KeyBinding`s for vim mode are displayed in the command palette.
It's worth pointing out that this whole thing was pretty much
implemented by Conrad Irwin during a pairing session, I just tried to
clean up some other changes introduced for a different issue, while
improving some comments.

Here's a quick list of the changes introduced:

- Update `KeyBinding` with a new `vim_mode` field to determine whether
the keybinding should be displayed in vim mode.
- Update the way `KeyBinding` is rendered, so as to detect if the
keybinding is for vim mode, if it is, only display keys in uppercase if
they require the shift key.
- Introduce a new global state – `VimStyle(bool)` - use to determine
whether `vim_mode` should be enabled or disabled when creating a new
`KeyBinding` struct. This global state is automatically set by the `vim`
crate whenever vim mode is enabled or disabled.
- Since the app's context is now required when building a `KeyBinding` ,
update a lot of callers to correctly pass this context.

And before and after screenshots, for comparison:

| before | after |
|--------|-------|
| <img width="1050" alt="SCR-20250205-tyeq"
src="https://github.com/user-attachments/assets/e577206d-2a3d-4e06-a96f-a98899cc15c0"
/> | <img width="1050" alt="SCR-20250205-tylh"
src="https://github.com/user-attachments/assets/ebbf70a9-e838-4d32-aee5-0ffde94d65fb"
/> |

Closes #14287 

Release Notes:

- Fix rendering of vim commands to preserve case sensitivity

---------

Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>

assets/keymaps/vim.json

@@ -37,9 +37,9 @@
       "[ [": "vim::PreviousSectionStart",
       "[ ]": "vim::PreviousSectionEnd",
       "] m": "vim::NextMethodStart",
-      "] M": "vim::NextMethodEnd",
+      "] shift-m": "vim::NextMethodEnd",
       "[ m": "vim::PreviousMethodStart",
-      "[ M": "vim::PreviousMethodEnd",
+      "[ shift-m": "vim::PreviousMethodEnd",
       "[ *": "vim::PreviousComment",
       "[ /": "vim::PreviousComment",
       "] *": "vim::NextComment",