Support for Shadow DOM

For #88719

With this change, instead of passing custom editor edit json back and forth with the extension host, we keep the original edit objects on the extension host. This means that we can pass extensions back the exact same edit object they first hand to us. It also means that edits no longer need to be json serializable.

Note that this is the total time the request has been in the server queue, not the actual execution time

 Right now, if TS has an error before we get back the full version string in the TSServer `'telemetry'` event, we end up logging just the basic version info (such as 3.8.0). We also want to include the pre-release tags (3.8.0-tsversion20200101)

This is already checked a few lines up

No more need to use monacoShadowRoot in createStyleSheet because all standalone editor calls are qualified

editor.insertSpaceAfterComment setting

 => comments.insertSpace

Fix a grammatical mistake in a docstring

Fixes scrollbar does not hide when the mouse leaves the window through the right edge