perf(treesitter): smarter languagetree invalidation

Problem:
  Treesitter injections are slow because all injected trees are invalidated on every change.

Solution:
    Implement smarter invalidation to avoid reparsing injected regions.

    - In on_bytes, try and update self._regions as best we can. This PR just offsets any regions after the change.
    - Add valid flags for each region in self._regions.
    - Call on_bytes recursively for all children.
       - We still need to run the query every time for the top level tree. I don't know how to avoid this. However, if the new injection ranges don't change, then we re-use the old trees and avoid reparsing children.

This should result in roughly a 2-3x reduction in tree parsing when the comment injections are enabled.

runtime/lua/vim/treesitter/query.lua

@@ -406,7 +406,7 @@ predicate_handlers['vim-match?'] = predicate_handlers['match?']
 ---@class TSMetadata
 ---@field [integer] TSMetadata
 ---@field [string] integer|string
----@field range Range
+---@field range Range4
 
 ---@alias TSDirective fun(match: TSMatch, _, _, predicate: any[], metadata: TSMetadata)