Fix Vite React plugin issue 619

[hi-ogawa]

Description

This PR adds comprehensive support and testing for the React.cache API within @vitejs/plugin-rsc, addressing the need for robust caching functionality (related to vitejs#619).

Key changes:

• Introduces a new example route (/react-cache) to demonstrate React.cache usage.
• Adds dedicated E2E tests in packages/plugin-rsc/e2e/basic.test.ts to verify React.cache's behavior, ensuring:
  • Identical inputs yield cached results.
  • Different inputs produce distinct results.
  • Functionality is consistent in both development and build modes.

This implementation clearly distinguishes React.cache from the existing "use cache" directive, providing separate examples and tests for each.

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