Add text objects to extensions (#21488)

Release Notes:

- Adds textobject support to erlang, haskell, lua, php, prisma, proto,
toml, and zig

extensions/lua/languages/lua/textobjects.scm

@@ -0,0 +1,7 @@
+(function_definition
+  body: (_) @function.inside) @function.around
+
+(function_declaration
+  body: (_) @function.inside) @function.around
+
+(comment)+ @comment.around