Swift/Kotlin/Elixir language highlighting?

Hi, all! I started using Outline a few days ago, and am loving it so far!

I'd like to propose adding three languages to have highlighting: Swift, Kotlin, and Elixir.

These languages both appear higher up on the [2022 Stack Overflow "Most Loved" languages list]( and have a high amount of users. Additionally, highlighting already supports Objective-C (for Swift) and Java (for Kotlin) respectively, so this may make it easier for such developers.

It appears that [Refractor]( already supports all three.
Testing locally, only three changes would seem to be changed: adding their imports & adding to the registration array in shared/editor/nodes/CodeFence.ts, and then adding to the LANGUAGES object in shared/editor/plugins/Prism.ts.

Thoughts on adding these languages? Would any other areas need editing to support?
Thank you!