- Renames a couple of metrics to include their units.
- Adds histogram buckets to `num_elements_per_batch`.
- Changes `batch_size_bytes` to a summary.
- Changes a couple of metrics to be gauges rather than counters.

Support multiple transactions in batch submitter

feat(proxyd): Add X-Forwarded-For header when proxying RPCs

feat(sdk): implement waitForMessageReceipt

feat(contracts): add in better gas oracle management

Updates the gas oracle hardhat task to also let it
manage the scalar and overhead.

go/stackman: Add stackman operator

feature - added op-exporter version metric

Converts Stackman into a Kube operator by adding the following:

- The basic Operator scaffolding. Things like RBAC, the manifests for the Operator itself, etc.
- CRDs for the DTL, Sequencer, Gas Oracle, Clique L1, batch submitter, deployer, and actors.

To see how the CRDs get used, see the nightly env in the stacks repo: https://github.com/ethereum-optimism/stacks/tree/master/nightly

Metadata:

- Fixes ENG-1673

Run dual tests for Synthetix

op-exporter version nil deference

integration-tests: Actor updates to run against nightly

- Modifies the existing actor tests to use predeployed contract addresses
- Exposes metrics about the actor via Prometheus

To see how the actors are set up using Stackman, see https://github.com/ethereum-optimism/stacks/blob/master/nightly/actors.yml.

Fixes ENG-1667

Remove logic for connecting contracts

Fixes codechecks reports

Fix in the generation of the artifacts & doc update

Fail CI if coverage threshold checks fail