feat(rspack): add generatePackageJson plugin

[travtarr]

Closes #226

[travtarr]

The e2e tests pass and I've successfully ran the builds when linking this to all my other Nest projects utilizing this rspack executor.

[kodeine]

@mandarini whenever you get time, can we please merge? thank you

[mandarini]

I'm approving @travtarr @kodeine , but please can you rebase with latest main?

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[travtarr]

I'm approving @travtarr @kodeine , but please can you rebase with latest main?

It's been rebased, thanks!

[kodeine]

@mandarini sorry for the tag :) would really appreciate if we can merge this, thank you for all the work you do!