resolve: add converters for sshfp key types and algs

resolve: add converters for sshfp key types and algs

With the data center move in the Fedora project, the ssh keys have changed.
The list with numerical values is hard to read…

$ resolvectl -t sshfp query pkgs.fedoraproject.org
Old:
pkgs.fedoraproject.org IN SSHFP 1 1 18270c9131ef9664861f5aa675a981146573cce0 -- link: wlp0s20f3
pkgs.fedoraproject.org IN SSHFP 1 2 b067e6eb4c3e2d0e8bb37d6799493b762131816fe979940bbe660470abe6efbb -- link: wlp0s20f3
pkgs.fedoraproject.org IN SSHFP 3 1 a1ad871a5eabe3027728d498a89895fb5bf5b290 -- link: wlp0s20f3
pkgs.fedoraproject.org IN SSHFP 3 2 c3dc523f99bb5155ec87f40fd1aa198c68f349d75beeccf60e87b44c9b461907 -- link: wlp0s20f3
pkgs.fedoraproject.org IN SSHFP 4 1 e1265f46012ee40967127e06cf5533b270568428 -- link: wlp0s20f3
pkgs.fedoraproject.org IN SSHFP 4 2 acaa1ee6292d01f1ae7881fdf03aaf7d7b0814e34e94c3558a25e4d1aaab8f94 -- link: wlp0s20f3
New:
pkgs.fedoraproject.org IN SSHFP RSA     SHA-1   18270c9131ef9664861f5aa675a981146573cce0 -- link: wlp0s20f3
pkgs.fedoraproject.org IN SSHFP RSA     SHA-256 b067e6eb4c3e2d0e8bb37d6799493b762131816fe979940bbe660470abe6efbb -- link: wlp0s20f3
pkgs.fedoraproject.org IN SSHFP ECDSA   SHA-1   a1ad871a5eabe3027728d498a89895fb5bf5b290 -- link: wlp0s20f3
pkgs.fedoraproject.org IN SSHFP ECDSA   SHA-256 c3dc523f99bb5155ec87f40fd1aa198c68f349d75beeccf60e87b44c9b461907 -- link: wlp0s20f3
pkgs.fedoraproject.org IN SSHFP Ed25519 SHA-1   e1265f46012ee40967127e06cf5533b270568428 -- link: wlp0s20f3
pkgs.fedoraproject.org IN SSHFP Ed25519 SHA-256 acaa1ee6292d01f1ae7881fdf03aaf7d7b0814e34e94c3558a25e4d1aaab8f94 -- link: wlp0s20f3