feat: add worker library generator

[NachoVazquez]

PR Checklist

Please check if your PR fulfills the following requirements:

• [x] The commit message follows our guidelines: CONTRIBUTING.md#commit
• [x] Tests for the changes have been added (for bug fixes / features)
• [x] Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

We can create worker applications but can not fully use Nx because we have yet to generate worker libraries.

What is the new behavior?

The nx-cloudflare plugin now allows the generation of Cloudflare Worker compatible libraries.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

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