Add support for Vim keybindings

[hootanht]

Fixes #238

Add support for Vim keybindings to the text editor.

• BuiltinShortcuts:

  • Add Vim keybindings to BuiltinShortcuts in src/Apps/NetPad.Apps.App/App/src/core/@application/shortcuts/builtin-shortcuts.ts.
  • Include keybindings for common Vim commands like Escape, :w, :q, and :wq.

• ITextEditorService:

  • Update ITextEditorService interface in src/Apps/NetPad.Apps.App/App/src/core/@application/editor/itext-editor-service.ts to include methods for enabling and disabling Vim mode.

• TextEditor:

  • Implement methods to enable and disable Vim mode in TextEditor class in src/Apps/NetPad.Apps.App/App/src/core/@application/editor/text-editor.ts.
  • Use monaco-vim library to integrate Vim keybindings with Monaco editor.

[tareqimbasher]

Thank you for the contribution @hootanht. There are a few items that are missing however that we'll need to address. The few that I see so far:

1. An indicator needs to be added (possibly in the status bar) that indicates the current vim mode (normal, insert, command). We'll also have to add/re-use some component to act as the command prompt for vim commands unless this is handled by the monaco-vim lib itself.
2. The PR currently does not handle what happens when vim commands like :w (save) and :wq (save and close tab) are entered
3. The monaco-vim library looks fine but it also doesn't seem to be actively maintained. Do we have other options?
4. This is a straight forward one but I thought I'd note it since I'm listing: the monaco-vim library should be added to the package.json file and we need to resolve a couple compilation errors

I could use the work you've put in here as a starting point, your efforts are much appreciated!

[tareqimbasher]

Update: I've made some progress here and I have a working version. Currently trying to figure out the best spot to put the edit status indicator and command input in the statusbar.