[WIP] build: use Rslib to build packages

[fi3ework]

Summary

This PR is far from complete, it's just here to document the migration process and identify potential issues (see the @rslib/core is even linked for debugging :P ). When this PR is ready for review, Rspress will be built by Rslib.

So far, just by looking at the output, the package can't be built is marked by "--wip--" and the reason is attached.

Related Issue

Checklist

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

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[fi3ework]

Will split into more separated PRs.