Autocrypt 2#8318
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Based on #8344
Closes #8317
Closes #8224. For Autocrypt 2 keys we set creation timestamp of the primary key and fallback subkey to 0. These timestamps cannot be changed. Direct key signature we already recreate before deriving the public key, and fallback subkey signature we can also recreate each time. For rotating subkey there is no problem as it will be recreated each 10 days. Autocrypt 1 key generation is not changed, we will likely want to remove it eventually anyway once Autocrypt 2 key generation is enabled.
There is a reference Rust implementation in https://codeberg.org/autocrypt2/autocrypt-v2-cert/ as well, we want to keep it in sync but i'm not using it directly as we don't need deterministic key generation, have different error handling, need to set timestamps to 0, and there going to still be changes to the specification. It would be great to merge the codebases and turn this into a single implementation properly published as a crate.