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