EOF Validation stricter on returncontract codes

Validation needs to be stricter on RETURNCONTRACT code sections. These are new rules that were added.

We need to implement two additional validations:

RETURNCONTRACT the subcontainer pointed to deploy_container_index must not contain a RETURNCONTRACT instruction.
it is an error for a container to contain both RETURNCONTRACT and either of RETURN or STOP.
it is an error for a subcontainer to never be referenced in its parent container
it is an error for a given subcontainer to be referenced by both RETURNCONTRACT and EOFCREATE

bluealloy / revm