Add an ability to `revert` change(s)

[nykma]

Since KVServer is designed as a git-like patch chain, there is an ability to implement a revert function which allows user to revert a specific change made accidentally by user himself before.

• Add a new action called revert (or delete ?)
• Signature needed
• When Revert is made, rebuild the whole KV status from scratch.

[ef3n9r98]

Hi @nykma, same with this issue - is there a budget for fixing this issue, and if so, how much?

Thanks!

[nykma]

Sorry but this issue is not a part of our bounty plan for now.