Activate more ESLint rules

[weeman1337]

Activate ESLint rules, that we skipped on migration: https://github.com/nordeck/matrix-widget-toolkit/pull/768/files#diff-9601a8f6c734c2001be34a2361f76946d19a39a709b5e8c624a2a5a0aade05f2

For PropsWithChildren the solution was to drop the generic type. It defaults to unknown.

Additionally there is now an extra type for „empty objects“.

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[changeset-bot]

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Latest commit: 42ea623

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[HarHarLinks]

changeset, since the API reports got updated?

[weeman1337]

changeset, since the API reports got updated?

🤷 before you were able to pass anything. Now you can do the same. We can add a patch note about that. What do you think?

[HarHarLinks]

If as a toolkit consumer I don't have to change anything then I guess we don't need anything.