Syncs with coder3101/tree-sitter-proto#22, which adjusts captures to
better align with nvim-treesitter conventions:
- Package idents use @module, extend/oneof idents use @type
- Adds map_field, oneof_field @property captures
- option/syntax/edition use @keyword.directive
- extend/extensions/oneof/service moved to @keyword.type
- key_type/type use @type.builtin; rpc_name uses @function.method
- Import paths use @string.special.path
- proto2/proto3 syntax strings use @string.special.symbol
- Simplifies comment captures (removes doc comment distinction)
Honestly not sure how well other tree-sitter clients handle the
nvim-specific highlights, but I figure this is the primary client I'm
(at least personally) concerned about.
