Format toml files (#30112)

* Add taplo fmt config for toml fmt

* fmt toml files

* Add even-better-toml to extensions recommendations

python/tidy/tests/servo-tidy.toml

@@ -12,8 +12,8 @@ wrong-key = true
 
 [ignore]
 files = [
-  "./fake/file.html",
+    "./fake/file.html",
 ]
 directories = [
-  "./fake/dir",
+    "./fake/dir",
 ]