feat(tests)!: new infrastructure based on makefile

Problem: Not easy to run all checks and tests locally. Redundant CI
workflows.

Solution: Separate CI into two workflows:
 * lint: Lua files (stylua, luals), query files (valid captures,
   predicates, directives using tsqueryls), docs
   (SUPPORTED_LANGUAGES.md) -- does not need parser installation
 * tests: parsers (ABI compatibility), query files (tsqueryls on
   Linux/macOS; nvim on Windows), highlight and indent tests (separated
   for better readability) -- needs parser installation (but only once)

Switch to https://github.com/nvim-treesitter/highlight-assertions fork
with ABI 15 support.

Run all tests (on Linux and macOS) through `make` (`formatlua`,
`checklua`, `lintquery`, `formatquery`, `checkquery`, `docs`, `tests`),
which downloads and caches all necessary dependencies.

Remove `update-readme` workflow (replaced by lint job on PRs).

TODO.md

@@ -4,17 +4,14 @@ This document lists the planned and finished changes in this rewrite towards [Nv
 
 ## TODO
 
-- [ ] **`install.lua`:** simply skip Tier 4 parsers (`get_install_info`)
-- [ ] **`parsers.lua`:** allow specifying version in addition to commit hash (for Tier 1)
+- [ ] **`parsers.lua`:** track versioned releases for tier 1
 - [ ] **`parsers.lua`:** add WASM support (tier 1)
 - [ ] **`install.lua`:** migrate to async v2
-- [ ] **tests:** fix, update (remove custom crate, plenary dependency)
-- [ ] **CI:** switch to ts_query_ls, add update readme as check (remove update job)
+- [ ] **tests:** remove custom crate, plenary dependency
 - [ ] **documentation:** consolidate, autogenerate?
 - [ ] **documentation:** migration guide
-- [ ] **indents:** rewrite (Helix compatible)
+- [ ] **indents:** rewrite (Helix or Zed compatible)
 - [ ] **textobjects:** include simple(!) `node`, `scope` (using `locals`) objects
-- [ ] **downstream:** adapt to breaking changes (`nvim-treesitter-refactor`)
 
 ## DONE
 
@@ -31,3 +28,4 @@ This document lists the planned and finished changes in this rewrite towards [Nv
 - [X] switch to upstream injection format
 - [X] remove locals from highlighting (cf. https://github.com/nvim-treesitter/nvim-treesitter/issues/3944#issuecomment-1458782497)
 - [X] drop ensure_install (replace with install)
+- [X] **CI:** switch to ts_query_ls, add update readme as check (remove update job)