* feat(l2geth): sequencer fee pricing

https://github.com/ethereum-optimism/go-ethereum/pull/273
https://github.com/ethereum-optimism/go-ethereum/pull/306
https://github.com/ethereum-optimism/go-ethereum/pull/305

* test(l1-l2-comms): fund l2 address before starting the test

* test(rpc): ensure that fee paid grows with data size

* test: add helper class for instantiation optimistic envs

* refactor: use the env container for l1<>l2 tests

* refactor: use the env container for queue ingestion and proxy tests

* fix(erc20-test): take fee payments into account

* refactor: use the env container for fee payment tests

* refactor: use the env container for native eth tests