Automatically prefix type only imports with type

this new option will take

`import { MessageIn } from "../models/index";`
and convert it to

`import type { MessageIn } from "../models/index";`

(only if it's only used as a type)

Author: svix-mman

src/postprocessing.rs

@@ -134,6 +134,7 @@ impl PostprocessorLanguage {
                         "lint",
                         "--only=organizeImports",
                         "--only=noUnusedImports",
+                        "--only=useImportType",
                         "--unsafe",
                         "--write",
                     ],