feat(anvil): dumpState / loadState on a forked anvil

[Maddiaa0]

Component

Anvil

Describe the feature you would like

Currently anvil has the capability to load and dump state to a file, enabling persistence. First introduced here: #3730.

At Aztec we have an in-house dev net running on an anvil mainnet fork. When adding the --state flag, it currently fails as state dumping is not yet implemented for the anvil fork_db back-end. I've naively hacked the functionality together here (see: https://github.com/cheethas/foundry/pull/1/files) and it appears to behave as I would expect.

If the above is satisfactory I can open a pull request iterating on my naive solution, however I thought I'd first ask in an issue, as I think there's big gotchas I've overlooked which led to it not being implemented in the pr above.

Additional context

N/A

[mattsse]

right, this is indeed missing, and we should include this.

please submit a PR here so we can review and get it merged.

from what I can tell, this looks pretty good already

[Maddiaa0]

closed by #4027