Recovery Key feature

### Please agree to the following

- [X] I have searched [existing issues](https://github.com/cryptomator/ios/issues?q=) for duplicates
- [X] I agree to follow this project's [Code of Conduct](https://github.com/cryptomator/ios/blob/develop/.github/CODE_OF_CONDUCT.md)

### Summary

Add recovery key feature

### Motivation

Desktop version offers an important feature: Recovery Key. As of now, when we create a vault through ios app, we are unable to go the recovery key and therefore recover password. We must use the desktop app.

ios app is very nice, be I feel this missing feature breaks the UX


I don't know if you plan to as there's not a lot of details in the [ios blog post](https://cryptomator.org/blog/2022/04/04/roadmap/#ios-version).

### Considered Alternatives

_No response_

### Anything else?

_No response_