* add withdrawalsRoot to ExecutionPayload.
* add a `BlocksV4` topic to p2p gossip and check for non-empty
  withdrawalsRoot on v4 topic.
* add checks for whether block is type v4 and apply relevant
  marshal/unmarshal for l2 withdrawals root.

* attributes check
* outputV0AtBlock api update
* minor type updates

and fixes for a few failures

when computing L2OutputRoot, no need to re-compute the storage root
if Isthmus is active.

and fix lint errors

* `RPCResponseCheck` is an interface that currently has a function
that validates withdrawals.
* There's an implementation of this interface for L1 and L2
* L1's response checker validates that the withdrawals list matches
  the root in the header.
* L2's response checker validates that the withdrawals list is empty
  when the withdrawalsRoot is not nil

will move to a separate PR

* test all combinations - with/without withdrawal transaction before, at and after isthmus

raise a separate PR for it.

Also fix a test in rollup, with the correct expectation for sepolia
holocene time