Publish a signed block.
Instructs the beacon node to broadcast a newly signed beacon block to the beacon network,
to be included in the beacon chain. A success response (20x) indicates that the block
passed gossip validation and was successfully broadcast onto the network.
The beacon node is also expected to integrate the block into the state, but may broadcast it
before doing so, so as to aid timely delivery of the block. Should the block fail full
validation, a separate success response code (202) is used to indicate that the block was
successfully broadcast but failed integration. After Deneb, this additionally instructs
the beacon node to broadcast all given blobs. The broadcast behaviour may be adjusted via the
broadcast_validation query parameter.