Add server option raw_video_stream

For convenience, this new option forces the 3 following options:
 - send_device_meta=false
 - send_frame_meta=false
 - send_dummy_byte=false

This allows to send a raw H.264 stream on the video socket.

Concretely:

    adb push scrcpy-server /data/local/tmp/scrcpy-server.jar
    adb forward tcp:1234 localabstract:scrcpy
    adb shell CLASSPATH=/data/local/tmp/scrcpy-server.jar \
        app_process / com.genymobile.scrcpy.Server 1.21 \
        raw_video_stream=true tunnel_forward=true control=false

As soon as a client connects via TCP to localhost:1234, it will receive
the raw H.264 stream.

Refs #1419 comment <https://github.com/Genymobile/scrcpy/pull/1419#issuecomment-1013964650>
PR #2971 <https://github.com/Genymobile/scrcpy/pull/2971>

server/src/main/java/com/genymobile/scrcpy/Server.java

@@ -253,6 +253,14 @@ public final class Server {
                     boolean sendDummyByte = Boolean.parseBoolean(value);
                     options.setSendDummyByte(sendDummyByte);
                     break;
+                case "raw_video_stream":
+                    boolean rawVideoStream = Boolean.parseBoolean(value);
+                    if (rawVideoStream) {
+                        options.setSendDeviceMeta(false);
+                        options.setSendFrameMeta(false);
+                        options.setSendDummyByte(false);
+                    }
+                    break;
                 default:
                     Ln.w("Unknown server option: " + key);
                     break;