Allow RSA 2048 and 4096 bit keys

Feature Proposal
13

I opened a PR to add RSA-4096 generation support, but no promises about an option being added to UIs:

It is probably more interesting to test and fix key import so users can generate whatever key they want and import it into Delta Chat reliably:

This way we will not need to clutter the UI with options.

I opened a separate topic to discuss key import:

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