Add text objects to extensions (#21488)

Release Notes:

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

extensions/zig/languages/zig/textobjects.scm

@@ -0,0 +1,27 @@
+(function_declaration
+    body: (_
+        "{"
+        (_)* @function.inside
+        "}")) @function.around
+
+(test_declaration
+    (block
+        "{"
+        (_)* @function.inside
+        "}")) @function.around
+
+(variable_declaration
+  (struct_declaration
+    "struct"
+    "{"
+    [(_) ","]* @class.inside
+    "}")) @class.around
+
+(variable_declaration
+  (enum_declaration
+    "enum"
+    "{"
+    (_)* @class.inside
+    "}")) @class.around
+
+(comment)+ @comment.around