Feat: Highlighter Provider Diffing

[thecoolwinter]

Description

Adds the ability to add and remove highlighters after the view is initialized. This allows for highlighter objects to be lazily loaded and added to the editor by developers.

This uses the object identifier to uniquely identify highlighter objects. This has the nice side effect of if a new highlighter is provided with the same type as an old one, we'll correctly set it up.

This is required for lsp semantic highlights, as we can't load the semantic highlighter object until after the language server has loaded the document.

Adds tests for this new feature, including moving, adding, removing and random modifications.

Related Issues

• ✨ Semantic Highlights CodeEdit#1950

Checklist

• I read and understood the contributing guide as well as the code of conduct
• The issues this PR addresses are related to each other
• My changes generate no new warnings
• My code builds and runs on my machine
• My changes are all related to the related issue above
• I documented my code

Screenshots

N/A

[0xWDG]

LGTM