feat: add X25519 yubikey recipient

[dlubawy]

This PR adds support of X25519 recipients with iqlusioninc/yubikey.rs#577 being merged.
Resolves issues #174 and #185.

Builds off of #190 to get the main branch on https://github.com/iqlusioninc/yubikey.rs working. I had to squash a lot of commits to get this done which is the reason for the co-authorship on 15e1731.

Opening this as a draft because I don't believe it is immediately able to be merged due to a couple factors. For one, the code over at yubikey.rs isn't released yet. Secondly, the new age update likely makes this code a bit more stale as the new tag recipient and PQ identities should be accounted for. Mostly opening this so the code can gain more visibility upstream of my fork and help prevent any duplication of work. Hopefully this helps out.

Change tracking

• Rebased onto main and modified original code to align with new native key updates

[michaelbeaumont]

@dlubawy there's a new prerelease of yubikey.rs, might be worth opening just the "update to latest yubikey" part of this PR as its own PR

[dlubawy]

@michaelbeaumont if I can find the time then I might take that up, but my focus is to get ahead of some of the recently fast moving changes in the code like the new native key support that just landed in main and over in the age-core lib. Those changes contain some more mainline support of multiple key types so I want to integrate my code better with those changes and am also selfishly looking to try adding tagged X-Wing support to my own YubiKeys.