Some API changes:

 - I changed the second param of NotebookOutputRenderer.render to a
   `NotebookRenderRequest` since we were up to four parameters already.
 - The request contains a unique `outputId`, which is generated when
   output is first created or restored (the ID is not stable if a
	 notebook is closed and reopened)
 - I changed the renderer events to `onDidCreateOutput` and
   `onWillDestroyOutput` since they're for outputs, not cells.
 - Additionally, they're called with objects that contain the output
   ID to render.

Fix #99253

Fix #94159

Fix #94314

Fix #99257

* notebook: initial note on acquiring the webview api

* fixup! meeting comments

* fixup! pr comments

Move data URL handling code out of preload script. Guess extension based  on mimetype if 'download' isn't provided

Fix #98101

- Infinite loop in syncing focus/selection where the view cell index is not the same as the model cell index
- Error thrown when dragging just above the top of the list

* Add vscode-webview-resource protocol

Adds a new protocol (`vscode-webview-resource`) for loading resources insides of webviews. This replaces the existing `vscode-resource` protocol and is registered on the main thread instead of in each renderer

This change also adds some rewriting logic to update any `vscode-resource:` references found in the main html to use `vscode-webview-resource` instead.

* Move webview protcol provider to own file

* Remove registration of vscode-resource scheme

* Remove use or parition for each webview

Now that we have a single shared protocol handler, we do not need to run each webview in its own partition

* Fix rewriting csp to use new protocol

* Update src/vs/code/electron-main/app.ts
Co-authored-by: NBenjamin Pasero <benjpas@microsoft.com>
Co-authored-by: NBenjamin Pasero <benjpas@microsoft.com>

Fixes some cell commands when a child of the cell row is selected