KeyValueStore: Method to check key-value store record exists

[drobnikj]

It is impossible to check if a key-value record exists, and users use kvs.getRecord instead, which is inefficient.

The implementation is simple: to check if a record exists, you can use an HTTP request with the method HEAD get Record API URL.

Method: keyValueStoreClient.exists(key: str): bool which returns true or false based on the record.

[tusharwebd]

Hi! New contributor here, I'd be interested to work on this. Can you share some more details? About where the existing method is implemented and where we want to implement the new method?