Move video video receiver transformable frame to modules/rtc_rtcp/source

Step 1 of combining the sender and receiver types

Also moved the RtpFrameObject to rtp_rtcp/source, as it's heavily used
by the transformable receiver frame, I couldn't work out a better way
of managing the dependencies, and everything else seemed to work fine.

Bug: chromium:1412687
Change-Id: I55e816a0d7aa2962560ff9ebaf30ad63ab0b9810
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/291710
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Tony Herre <herre@google.com>
Cr-Commit-Position: refs/heads/main@{#39255}
diff --git a/modules/video_coding/packet_buffer_unittest.cc b/modules/video_coding/packet_buffer_unittest.cc
index b147977..6969b02 100644
--- a/modules/video_coding/packet_buffer_unittest.cc
+++ b/modules/video_coding/packet_buffer_unittest.cc
@@ -17,7 +17,7 @@
 
 #include "api/array_view.h"
 #include "common_video/h264/h264_common.h"
-#include "modules/video_coding/frame_object.h"
+#include "modules/rtp_rtcp/source/frame_object.h"
 #include "rtc_base/numerics/sequence_number_unwrapper.h"
 #include "rtc_base/random.h"
 #include "test/field_trial.h"