Add rainbows for Lua (#14256)

Author: erasin

book/src/generated/lang-support.md

@@ -149,7 +149,7 @@
 | llvm-mir-yaml | ✓ |  | ✓ |  |  |  |
 | log | ✓ |  |  |  |  |  |
 | lpf | ✓ |  |  |  |  |  |
-| lua | ✓ | ✓ | ✓ |  |  | `lua-language-server` |
+| lua | ✓ | ✓ | ✓ |  | ✓ | `lua-language-server` |
 | luap | ✓ |  |  |  |  |  |
 | luau | ✓ | ✓ | ✓ |  |  | `luau-lsp` |
 | mail | ✓ | ✓ |  |  |  |  |

runtime/queries/lua/rainbows.scm

@@ -0,0 +1,9 @@
+[
+  (table_constructor)
+  (bracket_index_expression)
+  (parameters)
+  (arguments)
+  (field)
+] @rainbow.scope
+
+["(" ")" "[" "]" "{" "}"] @rainbow.bracket