Update supported algorithms for Zonemaster::LDNS::RR::DNSKEY->keysize()

[tgreenx]

Currently the method Zonemaster::LDNS::RR::DNSKEY->keysize() only supports DNSSEC algorithms variants of RSA (1, 5, 7, 8 and 10), DSA (3 and 6) and Diffie-Hellman (2).
It should be updated to also support more recent algorithms, e.g ECDSA, Ed and GOST.