chore: Use public API in test utilities (extractSnippet, ...)

Author: iwoplaza

packages/typegpu/tests/utils/parseResolved.ts

@@ -11,6 +11,7 @@ import type { Snippet } from '../../src/data/snippet.ts';
 import { $internal } from '../../src/shared/symbols.ts';
 import { CodegenState } from '../../src/types.ts';
 
+// TODO: Use a custom shader generator to extract the snippet before it's returned.
 export function extractSnippetFromFn(cb: () => unknown): Snippet {
   const ctx = new ResolutionCtxImpl({
     namespace: namespace({ names: 'strict' }),