Use federated modules in workers

[bollwyvl]

Problem

The workers currently don't participate in module federation, so they get key upstream kernel-level packages fixed at build time, e.g. @jupyterlite/contents. This makes it hard to test PRs on jupyterlite, and result in a few hundred extra kb on disk when loaded.

Proposed Solution

Figure out how to change the webpack configuration to make these workers consume upstream

Additional context

Some related comments:

• Throw EINVAL (28) in DriveFSEmscriptenNodeOps.readlink jupyterlite#1723 (comment)

[jtpio]

Linking to an upstream issue where this was discussed: jupyterlab/jupyterlab#10197

[bollwyvl]

With #247 in, i guess we're using rspack now. If this is going to be a slow burn with a lot of back-and-forth with the upstreams, we really need to see if this can be solved.