* feat: import the message relayer service

https://github.com/ethereum-optimism/optimism-ts-services/blob/1c6f8ad07afadc37ace76c9c63635d9b5132f6bd/src/services/message-relayer.service.ts

* chore: clean up unused types

* fix: do not try to run relayer unit tests

* ops(message-relayer): add docker image and compose settings

* test: add L1 <> L2 communication

* ci: parallelize building steps

* ci: try to resolve hardhat race condition