Support tree-sitter local parsers

Support tree-sitter local parsers

* doc/lispref/parsing.texi (Multiple Languages): Update manual.
* lisp/treesit.el (treesit-range-settings): Add LOCAL-P to range
setting.
(treesit-range-rules): Support :local keyword.
(treesit-local-parsers-at)
(treesit-local-parsers-in)
(treesit--update-ranges-local): New functions.
(treesit-update-ranges)
(treesit-font-lock-fontify-region)
(treesit--indent-1): Support local parsers and prioritize it over
global parsers.