feat: event transfer

[gikf]

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• [x] My pull request has a descriptive title (not a vague title like Update README.md).
• [x] My pull request targets the main branch of Chapter.

Ref #1927

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• Fully reusing existing mutations. That's pretty cool (:sunglasses:), but let me know if I should rather create separate mutation for it in resolver, and offload logic there.
• I've added custom hooks to reuse canceling and event creating logic from client as much as possible.
• Original chapter is filtered out from the list of available chapters when transferring.
• Button to transfer is displayed only if user has admined >= 2 chapters.
• Added header to the form, to make clearer what page is that (Create Event, Edit Event, Transfer Event).
• I'm going to still add tests, either to this PR or separate. But it can be looked at already.

[ghost]

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