Equality checks

[sewnie]

Currently, with AgeKeyPair, AgeIdentity, and AgeRecipient, there are no special == operators nor is there a hashCode.

While something like this would be relatively easy to implement, i am unfortunately unable to do so due to the test suite failing to run on my machine. Any test that is ran will encounter an SocketException: Write failed (OS Error: Broken pipe, errno = 32), port = 0 exception.

Thanks.