Support SSZ in proposer api #285
Description
ref: https://github.com/ethereum/builder-specs/tree/main/apis/builder
mev boost:
- Add getHeader SSZ support flashbots/mev-boost#734
- Add getPayload SSZ support flashbots/mev-boost#742
- Add SSZ tests for registerValidator flashbots/mev-boost#741
commit boost: Commit-Boost/commit-boost-client#372
priority should be for get header, and ideally we do different endpoints in separate PRs