Kate - Initial Rust LSP support landed!

Initial support for the rls Rust LSP server has landed in kate.git master. The matching rls issue about this can be found here.

Given I am no Rust expert, I can only verify that at least some operations seem to work for me if the Rust toolchain is setup correctly ;=)

The current experience isn't that nice as with clangd, for example I get no symbols outline here. What is possible with clangd can be seen in one of my previous posts, video included.

Any help to improve this is welcome. The patch that landed can be viewed here, lend a hand if you know how to fix up stuff!