Jetbrains keymap updates

[jtaub]

Closes #14639

Release Notes:

Various improvements to the Jetbrains keymap. Added various missing keyboard shortcuts that I use on a daily basis in Jetbrains, and changed a few which were present in the keymap but mapped to the wrong behavior.

Added:

• Added various missing keybindings for Jetbrains keymap
  • ctrl-n → project_symbols::Toggle
  • ctrl-alt-n → file_finder::Toggle (open project files)
  • ctrl-~ → git::Branch
  • ctrl-\ → assistant::InlineAssist
  • ctrl-space → editor::ShowCompletions
  • ctrl-q → editor::Hover
  • ctrl-p → editor::ShowSignatureHelp
  • ctrl-f5 → task::Rerun
  • shift-f9 → debugger::Start
  • shift-f10 → task::Spawn
• Added macOS equivalents for all of the above, however I only have a Linux machine so I have not tested the mac bindings. The binding are generally the same except ctrl → cmd with few exceptions.
  • cmd-j → editor::Hover

Fixed:

• Several incorrectly mapped keybindings for the Jetbrains keymap
  • ctrl-alt-s → editor::OpenSettings (was editor::OpenSettingsFile)
  • ctrl-alt-b → editor::GoToImplementation (was editor::GoToDefinitionSplit)
  • alt-left → pane::ActivatePreviousItem
  • alt-right → pane::ActivateNextItem
• ctrl-k now opens the Git panel. I believe this was commented out because of a bug where focus is not given to the commit message text box, but imo the current behavior of not doing anything at all feels more confusing/frustrating to a Jetbrains user (projecting a little here, happy to revert).

[zed-industries-bot]

	Warnings
⚠️	This PR is missing release notes. Please add a "Release Notes" section that describes the change: Release Notes: - Added/Fixed/Improved ... If your change is not user-facing, you can use "N/A" for the entry: Release Notes: - N/A

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