Keep epoch contents in permanent storage in epochstorage plugin

[jkrvivian]

Description of change

• Keep epoch contents in permanent storage
• Add /ec endpoint to fetch current ec

Type of change

• Enhancement

Change checklist

• My code follows the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[karimodm]

Yeah, that works!!! I just left a comment to use the WithRealm instead of prepending the key of an object with its prefix every time.

[karimodm]

I wouldn't append the prefix so directly. You can use baseStore.WithRealm to obtain a copy of the same underlying KVStore with the prefix set for you; so each object you operate on will always have that realm (prefix).