Bedrock: share more test utils, cleanup derive package structure, move payload/attributes types to eth package (#2761)

* feat(bedrock): move ExecutionPayload, PayloadAttributes and other engine types from l2 to eth package

* chore(bedrock): clean up derive package, move test util out or polish for public use, split payload_attributes and improve file names

* chore(bedrock): move more test utils out of derive and driver packages into shared package

* bedrock: fix go import newlines/order

* testutils: describe TestID usage
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>