This PR moves core/beacon to beacon/engine so that beacon-chain related code has its own top level package which also can house the the beacon lightclient-code.
This PR builds on #26299, but also updates the tests to the most recent version, which includes tests regarding TheMerge.
This change adds checks to the beacon consensus engine, making it more strict in validating the pre- and post-headers, and not relying on the caller to have already correctly sanitized the headers/blocks.
* core: recover the state in SetChainHead if the head state is missing
* core: disable test logging
* core: address comment from martin
* core: improve log level in case state is recovered
* core, eth, les, light: rename SetChainHead to SetCanonical
Felföldi Zsolt
rjl493456442
