Closes#43784Closes#44375Closes#21057
This PR updates the Proto extension to include support for two new
language servers as well as an updated grammar for better highlighting.
Release Notes:
- Improved Proto support to work better out of the box.
This PR extracts the Protocol Buffers support into an extension.
Release Notes:
- Removed built-in support for Protocol Buffers, in favor of making it
available as an extension. The Protocol Buffers extension will be
suggested for download when you open a `.proto` file.