Disable list of commands from playground repositories

[amankumarsingh77]

This PR focuses on a blacklist feature that does not allow a set of commands to run in the DiceDB Playground project.
fixes DiceDB/dice#897
Changes

1. Updated helpers.go:
   • Added a service layer to intercept and reject the request.
2. Updated httpServer.go:
   • Implement the service layer and reject with a forbidden status

Testing

• Verified that commands listed in the blacklist are properly rejected with the correct error message.
• Confirmed that all other commands function as expected.

[lucifercr07]

Since issue was assigned to another user and their PR is already created, it won't be good if we continue with this PR. Closing this PR, really thanks for your contribution.