Integrate with `/health` API to render Next clean up time and Commands left on initial connect

[lucifercr07]

Ref: dicedb/playground-mono#52

• This change is required to be done so that UI can call /health API to render these values instead of depending on command triggers.
• Add integration/unit tests for the same

[aasifkhan7]

I can take this up @lucifercr07

[lucifercr07]

@aasifkhan7 assigned, please collaborate with @rishavvajpayee as he's implementing the backend task.

[aasifkhan7]

@lucifercr07 Here’s the pull request for your review: PR #82 - DiceDB/alloy.
@rishavvajpayee I’ve added comments on the following PR: PR #54 - DiceDB/playground-mono.