[FEATURE] Add api/nonprofits/:nonprofit_id/events/:event_id/ticket_levels and ./:id

[wwahammy]

Depends on #668

[github-actions]

⏳ Alright! Looks like we need to wait for some dependencies:

• #668

💡 Don't worry, I will continue watching the list above and keep this comment updated. To add or remove a dependency please update this issue/PR description.

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