Add support for ed25519 keys

[Client support for Rekor V2: sigstore-python](https://github.com/sigstore/rekor-tiles/issues/289)


**Description**



The new RekorV2 will support ed25519 keys. We should add support for this key type.

 - https://github.com/sigstore/rekor-tiles/blob/c99e15d8a668fc34fc101548ae3e30092def0fd4/compose.yml#L63
 - https://github.com/sigstore/sigstore-python/blob/572ccac5cf4b69b55c183e0511367b023d1c85fd/sigstore/_internal/trust.py#L144-L160

	if isinstance(self.key, rsa.RSAPublicKey):
	self.key.verify(
	signature=signature,
	data=data,
	# TODO: Parametrize this as well, for PSS.
	padding=padding.PKCS1v15(),
	algorithm=self.hash_algorithm,
	)
	elif isinstance(self.key, ec.EllipticCurvePublicKey):
	self.key.verify(
	signature=signature,
	data=data,
	signature_algorithm=ec.ECDSA(self.hash_algorithm),
	)
	else:
	# Unreachable without API misuse.
	raise VerificationError(f"keyring: unsupported key: {self.key}")

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