`useDefineForClassFields = false` is apparently required for Lit

Adds copy sha and alt+click to pick another commit for sha button
Adds keyboard up/down/enter/space support for the files list
Tweaks styling to match vscode & themes

- Updates button styles to match vscode
- Updates commit message text styling

Removes commit details webview (tab-based)

- adds lit components
- exposes webview in WebviewViewBase
- adds pointer cursor to enabled buttons
- adds custom events support to DOM utility

Reworks all usages to use configuration.get

- Adds override support to configuration
 - Splits configuration.get into get & getAll
 - Allows passing array to configuration.changed
Avoids getting the entire configuration on startup

- Changes request failures to only disconnect the integration for the current session
 - Limits to 5 failed request before disconnecting the integration
 - Avoids disconnect prompt for current session disconnections
 - Adds don't show again to request failure messages
 - Adds integration suspension message w/ don't show again option

* update vscode git api
* force-push for non-HEAD commit & commit widget

- Showing and refreshing the _Commits_ view
  - Expanding commits, branches, and worktrees

Removes unused key property