* Improvements/bugfixes to Go forge scripts

Adds some improvements to the Go forge scripts:

- Adds a `GasUsed` field to the `Broadcast` struct so that transaction broadcast utilities can use it for gas estimation. Gas estimation using the RPC will fail when sending transactions in parallel since the state can change significantly between calls.
- Fixes a bug in the `vm.broadcast` cheatcode where sender nonce were not increased for `vm.CALL`s. This led to a mismatch between the contract addresses generated by the Forge tooling, and what was actually being generated onchain.

* op-chain-ops: isolate broadcast functionality

* review updates

* wrap in broadcast check

* Add nonce tests

* Update op-chain-ops/script/script.go
Co-authored-by: protolambda <proto@protolambda.com>

* Fix test

* op-chain-ops: track broadcast nonce, add sanity checks

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Co-authored-by: protolambda <proto@protolambda.com>