Streamlined query node for actions/reducers

[hgedia]

Summary

The only way to access actions is to ask an archive node, and they are expected to provide historical actions for all accounts for all time. A more streamlined query node could be developed that only stores actions for registered accounts, and it is optimized for providing the data about those accounts quickly. zkApp developers would benefit from a less expensive node infrastructure to have actions and reducers than running a full archive node.