For #68302

We will eventually have to move our vs/workbench/api/electron-browser/mainThread.* files into browser or common to support running extensions without node integration.

When I look at an example (mainThreadLanguages.ts) a common pattern seems to be a dependency to node/extHost.protocol which seems to contain both types for the renderer side as well as the extension host side.

As a first step I would think node/extHost.protocol needs to split up into 2 parts, where the one is clearly the types accessed within the extension host and the other from the renderer side (which then can live in common or browser).

Thoughts?