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).

scripts/check-queries.lua

@@ -6,29 +6,6 @@ local configs = require('nvim-treesitter.parsers')
 local parsers = #_G.arg > 0 and { unpack(_G.arg) }
   or require('nvim-treesitter.config').installed_parsers()
 
--- Extract captures from documentation for validation
-local captures = {} ---@type table[]
-do
-  local current_query ---@type string
-
-  for line in io.lines('CONTRIBUTING.md') do
-    if vim.startswith(line, '### ') then
-      current_query = line:sub(5):lower() ---@type string
-    elseif vim.startswith(line, '@') and current_query then
-      if not captures[current_query] then
-        captures[current_query] = {}
-      end
-
-      table.insert(captures[current_query], vim.split(line:sub(2), ' ')[1])
-    end
-  end
-
-  -- Complete captures for injections.
-  for lang, _ in pairs(configs) do
-    table.insert(captures['injections'], lang)
-  end
-end
-
 -- Check queries for each installed parser in parsers
 local errors = {} ---@type string[]
 local timings = {} ---@type { duration: number, lang: string, query_type: string }[]
@@ -46,19 +23,6 @@ do
         print(string.format('Checking %s %s (%.02fms)', lang, query_type, duration * 1e-6))
         if not ok then
           errors[#errors + 1] = string.format('%s (%s): %s', lang, query_type, query)
-        else
-          if query then
-            for _, capture in ipairs(query.captures) do
-              local is_valid = (
-                vim.startswith(capture, '_') -- Helpers.
-                or vim.list_contains(captures[query_type], capture)
-              )
-              if not is_valid then
-                errors[#errors + 1] =
-                  string.format('%s (%s): invalid capture "@%s"', lang, query_type, capture)
-              end
-            end
-          end
         end
       end
     end