Rename all references of actionsHash to actionState

[MartinMinkov]

Summary

This pull request introduces breaking changes to improve naming consistency with the Mina protocol implementation. We've renamed all references of actionsHash to actionState. These changes affect variables, function parameters, and object keys throughout the codebase.

🔗 Associated changes to the docs are located here: o1-labs/docs2#345

[Trivo25]

I wonder if we plan on releasing a minor version before the next big one, if that's the case imo we should wait with merging cc @jasongitmail

edit: ah nvm, I dont think this touches any public APIs 👍

[MartinMinkov]

I wonder if we plan on releasing a minor version before the next big one, if that's the case imo we should wait with merging cc @jasongitmail
edit: ah nvm, I dont think this touches any public APIs +1

The intention behind this PR was to be consistent with this PR too :P #828

It renames the input parameters fromStateHash and endStateHash to fromStateAction and endStateAction. As a follow-up, we've also renamed actionHash to actionState for the reducer.

This update does affect the public API, but no worries - the new release is already planned as a breaking change due to the getActions renaming.

[mitschabaude]

reopened this because it isn't merged yet :D