feat(treesitter)!: incremental injection parsing

Problem:

Treesitter highlighting is slow for large files with lots of injections.

Solution:

Only parse injections we are going to render during a redraw cycle.

---

- `LanguageTree:parse()` will no longer parse injections by default and
  now requires an explicit range argument to be passed.

- `TSHighlighter` now parses injections incrementally during on_win
  callbacks for the line range being rendered.

- Plugins which require certain injections to be parsed must run
  `parser:parse({ start_row, end_row })` before using the tree.

runtime/lua/vim/treesitter/query.lua

@@ -435,6 +435,7 @@ predicate_handlers['vim-match?'] = predicate_handlers['match?']
 
 ---@class TSMetadata
 ---@field range? Range
+---@field conceal? string
 ---@field [integer] TSMetadata
 ---@field [string] integer|string