Missing highlighting and LSP for ANTLR4

### Check for existing issues

- [x] Completed

### Language

ANTLR4

### Tree Sitter parser link

_No response_

### Language server link

https://github.com/kaby76/AntlrVSIX

### Misc notes

I guess it would require to first build a tree-sitter for ANTLR4 which is quite a work itself and quite an inception. 
But it would cool to have it. 