Removes strict-boolean-expressions because its too noisy

Avoids unneeded `void`s to know if return value is intentionally discarded
Uses `type` imports when possible (avoids unneeded bundling)

This enables basic multi-select support, but commands have not been audited for proper support and may fail completely or corrupt data (try it at your own risk)

Commands run with multi-select will sequentially execute the command for each selected item (assuming each item is of the same type at the active item, e.g. the item the context menu was shown for), unless they are specifically multi-select aware.

Currently only dropping stashes is now multi-select aware.

`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