Add rename functionality

LSP Spec:
https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textDocument_rename

POC: https://github.com/elixir-lsp/elixir-ls/pull/676

There are many things that can be renamed:

- [ ] function/marco/guard/delegate
- [ ] callback/macrocallback
- [ ] overridable function/macro
- [ ] module
- [ ] behaviour
- [ ] protocol
- [ ] attribute
- [ ] variable
- [ ] type
- [ ] type parameter
- [ ] struct field
- [ ] record field

Obviously not everything from that list is high proritity