fix: lazy load DTS plugin modules

[BleedingDev]

Summary

• Lazy-load @module-federation/dts-plugin from the Rspack plugin only when DTS is enabled.
• Lazy-load @module-federation/dts-plugin/core from manifest metadata generation only when DTS metadata is needed.
• Add Jest coverage proving disabled DTS paths do not resolve the DTS packages.

Why

Consumers that disable DTS should not need the DTS plugin packages to be resolved or imported at runtime. A plain nested require() was not enough here because Rslib rewrote it into a top-level ESM import, so this uses createRequire(import.meta.url) to keep both CJS and ESM outputs lazy.

Validation

• pnpm --filter @module-federation/manifest --filter @module-federation/rspack run lint
• pnpm exec jest --config packages/manifest/jest.config.js --runInBand
• pnpm exec jest --config packages/rspack/jest.config.js --runInBand
• pnpm --filter @module-federation/manifest... --filter @module-federation/rspack... run build

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Latest commit: 044311a

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