Converts file changed web components to Lit

- Replaces "Toggle <x>: <state>" pattern with actual toggle action

- Bumps Graph component w/ new mulitline commit message rendering

- Removes pinning notion from search & compare view
 - Removes "Keep Results" toggle from search & compare view
Persists "reviewed" checkboxes in comparisons

* Adds secondary remote match and improves branch resolution

* Updates branch format to {owner}/{repoName}:{branchName}

- Reserves indicator dot for all vs current filtering
 - No longer considers merge commit dimming as a "filter"

Adds `data-vscode-context` w/ a webview id property for context menus

Adds uri encoding

Wraps ServerConnection to handle auth specific requests
Consolidates GK token access in ServerConnection through SubscriptionService

Changes `GitDiff` to `GitDiffFile` and adds new `GitDiff`