Expose a webview panel's view state as properties. Make WebviewPanelOnDidChangeViewStateEvent only fire an event with the webview who's state changed

Adds a new optional  `CodeActionProviderMetadata`.  This is passed in`registerCodeActionProvider` and contains a list of`CodeActionKinds` that the provider may return. The list is used for deciding when to show the `refactor` and `source action` context menus. It is not used for filtering the returned code actions

Possibly helps address #45383

- Split folder configurations into node based and file service based
- Reload configurations after acquiring file service

print an info message when the extension your are developing is using a 'generic' document selector, #21886

fixes #46898