test: use hardhat-ethers for importing factories in integration tests

go/proxyd: Add integration tests and batch support

- Fixes ENG-1903

Split OVMMulticall.sol into Multicall.sol & OVMContext.sol in integration tests

Version Packages

Develop -> Master PR

chore: add changeset for l2geth

Add missing changeset for https://github.com/ethereum-optimism/optimism/pull/2011

A replica can be configured with the flag
`--sequencer.clienthttp` or the env var
`SEQUENCER_CLIENT_HTTP` which points to the
sequencer and when users hit the RPC endpoint
`eth_sendRawTransaction` it will forward the
value to the sequencer.

If running a mainnet node, this value should be
set to `https://mainnet.optimism.io` or an
infrastructure provider such as Quiknode, Infura
or Alchemy.

feat: regenerate receipt json for optimism fields

l2geth: forward tx to sequencer

(feat): Split OVMMulticall into Multicall (makerdao impl) and OVMContext (used as base contract for OVMContextStorage)

fix: configurable L2 fee enforcement in ops

chore(deps): bump follow-redirects from 1.14.3 to 1.14.7

chore(deps-dev): bump shelljs from 0.8.4 to 0.8.5

Adds depcheck to CI

Release PR

Version Packages

Develop -> Master

fixed file extensions in integration tests

Bumps [shelljs](https://github.com/shelljs/shelljs) from 0.8.4 to 0.8.5.
- [Release notes](https://github.com/shelljs/shelljs/releases)
- [Changelog](https://github.com/shelljs/shelljs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/shelljs/shelljs/compare/v0.8.4...v0.8.5)

---
updated-dependencies:
- dependency-name: shelljs
  dependency-type: direct:development
...
Signed-off-by: dependabot[bot] <support@github.com>

Fix proxyd build

We need to manually include musl headers and GCC now that proxyd has a geth dependency and needs CGO.

bss: split up SubmitBatchTx method in Driver iface

Previously it was being logged every time we modified the gas price.
Additionally, we log the raw byte length rather than tx.Size(). The
latter returns a float value of type StorageSize, which explains why the
metrics haven't been indicating actual byte values.

The current interface supports only one method for both crafting and
publishing a batch transaction, SubmitBatchTx. Currently this is being
executed on each new gas price that the txmgr commands, implying we are
doing a lot of extra work to rederive batches. In addition, much our
instrumentation lives inside this method, meaning that the they are also
being recorded multiple times per transaction. When we get to
processing larger batches on Kovan and Mainnet, this could also become a
resource bottleneck.

This commit remedies all of the above issues by splitting out the
transaction crafting process from the publication. A new method,
CraftBatchTx, is added to the Driver interface. This method is
responsible for creating a fully formed transaction, but does not
publish it. The responsibility of SubmitBatchTx is now modified to take
an predefined transaction, i.e. created by CraftBatchTx, overwrite the
supplied gas price, and publish. In this way, this expensive call to
build batches can be done once before handing the transaction of the
txmgr.

fix(batch-submitter): clear state root batches

Fixes a bug where both the sequencer and proposer main loops were
attempting to clear the pending transactions from the batch-tx
submitter's wallet. The impact is that we may have been overspending on
fees due to conflicting/reverting state batches. However the impact
overall should be minor given the relative size of state batches in
comparison to tx-batches.