feat(runtime): add query filetype (#17905)

used for Tree-sitter queries
uses Lisp runtime files

(in Lua to distinguish from upstream runtime files)

runtime/ftplugin/query.lua

@@ -0,0 +1,6 @@
+-- Neovim filetype plugin file
+-- Language:	Tree-sitter query
+-- Last Change:	2022 Mar 29
+
+-- it's a lisp!
+vim.cmd [[ runtime! ftplugin/lisp.vim ]]

runtime/indent/query.lua

@@ -0,0 +1,6 @@
+-- Neovim indent file
+-- Language:	Tree-sitter query
+-- Last Change:	2022 Mar 29
+
+-- it's a lisp!
+vim.cmd [[ runtime! indent/lisp.vim ]]

runtime/lua/vim/filetype.lua

@@ -1424,6 +1424,8 @@ local pattern = {
       return "git"
     end
   end,
+  -- Neovim only
+  [".*/queries/.*%.scm"] = "query", -- tree-sitter queries
   -- END PATTERN
 }
 -- luacheck: pop