feat(l1,sequencer,archiver): custom forwarder contracts

[just-mitch]

Presently, proposers need to use a forwarder contract to batch/bundle actions to make during their assigned L2 slot (e.g. proposing a block, voting, etc). Aztec Labs provides provides a standard implementation to this end.

However, pre-deploying a separate, custom forwarder contract with a different ABI and supplying that address as the one to be used is not supported.

Search for this issue number in the codebase.