Upgrade to Java 21, add DataRequest system and RedisParsableMessage u…

[Maploop]

Example DataRequest usage:

import net.swofty.redisapi.api.requests.DataRequest;
import net.swofty.redisapi.api.requests.DataRequestResponder;
import org.json.JSONObject;

public class Example {
    public void sendDataRequest() {
        JSONObject requestData = new JSONObject()
                .put("data key", "data value");

        DataRequest req = new DataRequest("filterID", "key", requestData);

        req.await().thenAccept(response -> {
            if (response.data() == null) {
                // Timed out
                return;
            }

            // Use data
            response.data();
            response.latency();
        });
    }

    public void registerResponder() {
        DataRequestResponder.create("key", (request) -> {
            JSONObject response = new JSONObject();
            response.put("data to send back", "anything");
            return response;
        });
    }
}