https://github.com/ethereum/beacon-APIs/blob/master/apis/validator/register_validator.yaml
ethereum/consensus-specs#2884

Note, we do not need to implement this API. Teku will send sign request

Tasks

• Add new signing type (ArtifactType)
• Add to Eth2SigningRequestBody (entrypoint)
• Update data models
• Update OpenAPI schema
• Process request to perform signing
• Integration tests
  est. 2
• Acceptance Tests to verify OpenAPI
• Communicate API changes to unblock validator client teams
  est. 1

To be estimated separately:

• [MEV Boost\Builder] ValidatorRegistration signature - web3signer integration teku#5644 - Wire up the request from teku: https://github.com/ConsenSys/teku/blob/78013c1b0520dfdbfcb8abfde7c69b5841993d38/validator/client/src/main/java/tech/pegasys/teku/validator/client/signer/ExternalSigner.java#L260