Querying a storenode should not require keeping local history

[jm-clius]

Currently querying a storenode for history requires mounting store protocol. Currently this implies that every node querying history will itself act as a storenode and keep local history. The configuration for keeping history and querying for history needs to be separated.

Previously this separate configuration was allowed, but resulted in nil access errors (#439) prompting a change in how/when protocols are mounted. It should be possible, though, to have store protocol mounted and query for historical messages from storenode without having to keep local history.

Acceptance criteria

• A wakunode2 can be configured with a storenode and successfully query that storenode for historical messages without having to be a "full" storenode that keeps local history itself.

[oskarth]

Probably duplicate of above, closing