feat(webpack): use Rslib to bundle

[chenjiahan]

Summary

Use Rslib to bundle @rsbuild/webpack.

Related Links

Blocked by web-infra-dev/rslib#287.

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[9aoy]

!eco-ci

[9aoy]

📝 Ran ecosystem CI: Open

suite	result
modernjs	❌ failure
plugins	✅ success
rspress	✅ success
rslib	✅ success
examples	✅ success