feat: return CompletableFuture instead of only Future

Author: metacosm

backend/src/main/java/net/laprun/sustainability/power/nuprocess/OutputRecordingProcessHandler.java

@@ -4,7 +4,6 @@
 import java.io.InputStream;
 import java.nio.ByteBuffer;
 import java.util.concurrent.CompletableFuture;
-import java.util.concurrent.Future;
 
 import io.quarkus.logging.Log;
 
@@ -40,7 +39,7 @@ public void onStdout(ByteBuffer buffer, boolean closed) {
         }
     }
 
-    public Future<InputStream> getInputStream() {
+    public CompletableFuture<InputStream> getInputStream() {
         return output;
     }
 }