KV Store Implementation

Implement a key-value (KV) store system with the following functionalities: set(key, value): Sets a key-value pair with the given key and value. get(key): Retrieves the value of the key-value pair with the given key. shutdown(): Simulates shutting down the system. restore(): Restores the system from a shutdown state. Note: Consider how the system should handle scenarios where there is a size limit on data. Example Input kv_store.set('x', 'y') print(kv_store.get('x')) Output y