This commit adds a better error message when there
is an error for proxying user requests to the sequencer.
This allows the change to be relatively backwards compatible
as a good error message is returned when the sequencer url
is not configured.

Enforced import ordering in eslint

go/proxyd: Properly handle null results

Both the `Error` and `Result` fields on `RPCRes` had `omitempty` tags, so null results were being swallowed. We didn't catch this in integration tests because JavaScript tolerates missing keys. This is now fixed by using a custom JSON marshaler.

Fixes #2049

l2geth: Add commands to initialize from a URL, and dump the current chainstate

This PR adds two commands to l2geth:

- `geth init <url> <genesisHash>`, which will download a remote genesis JSON file, compare its hash to the one specified on the CLI, then reinitialize the chain config.
- `geth dump-chain-cfg`, which will dump the current chain config to stdout.

These commands will make it easier for us to adopt the upcoming gas schedule hardfork.

Fixes: ENG-1906

integration-tests: Changes to make it work with live networks again

chore(deps): bump trim-off-newlines from 1.0.1 to 1.0.3

l2geth: fix monotonicity logging bug

feat: add confirmation depth awareness to txmgr

go/proxyd: Cache block-dependent RPCs

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

The logline `Blocknumber monotonicity violation`
was being logged erroneously. This commit ensures
that it is not logged when it doesn't need to be
logged.

It would previously log if the L1 blocknumber
was equal to or less than and now it only logs
if the L1 blocknumber is less than.

Bumps [trim-off-newlines](https://github.com/stevemao/trim-off-newlines) from 1.0.1 to 1.0.3.
- [Release notes](https://github.com/stevemao/trim-off-newlines/releases)
- [Commits](https://github.com/stevemao/trim-off-newlines/compare/v1.0.1...v1.0.3)

---
updated-dependencies:
- dependency-name: trim-off-newlines
  dependency-type: indirect
...
Signed-off-by: dependabot[bot] <support@github.com>

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