Normalize a server signer pubkey hex to the x-only (32-byte) form contract
scripts and params.serverPubKey use. A 33-byte compressed key drops its
parity prefix; a 32-byte key is canonicalized to lowercase. The active
signer and the deprecated signers (which arkd may advertise compressed)
compare equal to the x-only params.serverPubKey persisted on contracts.
Normalize a server signer pubkey hex to the x-only (32-byte) form contract scripts and
params.serverPubKeyuse. A 33-byte compressed key drops its parity prefix; a 32-byte key is canonicalized to lowercase. The active signer and the deprecated signers (which arkd may advertise compressed) compare equal to the x-onlyparams.serverPubKeypersisted on contracts.