chore: use import type to import only swc types

to make it clear to humans and the compiler that no values are imported.

Author: ericcrosson-bitgo

packages/openapi-generator/src/resolveInit.ts

@@ -1,4 +1,4 @@
-import * as swc from '@swc/core';
+import type * as swc from '@swc/core';
 import type { Block } from 'comment-parser';
 import * as E from 'fp-ts/Either';
 import { dirname } from 'path';