This simple MR aims to introduce some synchronization utils that will be necessary for !9490 in the context of %Non-blocking RPC feature as experimental:

This is a good opportunity to try to understand why this could be necessary when a RO instances opens the storage concurrently to a RW one.

Manually testing the MR

Green CI -- dead code

Checklist

Document the interface of any function added or modified (see the coding guidelines)
Document any change to the user interface, including configuration parameters (see node configuration)
Provide automatic testing (see the testing guide).
For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
Select suitable reviewers using the Reviewers field below.
Select as Assignee the next person who should take action on that MR