Copy video frames metadata between encoded and plain frames in one place

Currently some video frames metadata like rotation or ntp timestamps are
copied in every encoder and decoder separately. This CL makes copying to
happen at a single place for send or receive side. This will make it
easier to add new metadata in the future.

Also, added some missing tests.

Bug: webrtc:10460
Change-Id: Ia49072c3041e75433f125a61050d2982b2bec1da
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/133346
Commit-Queue: Ilya Nikolaevskiy <ilnik@webrtc.org>
Reviewed-by: Johannes Kron <kron@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27719}

modules/video_coding/encoded_frame.h

@@ -52,8 +52,10 @@ class VCMEncodedFrame : protected EncodedImage {
     return static_cast<const webrtc::EncodedImage&>(*this);
   }
 
+  using EncodedImage::ColorSpace;
   using EncodedImage::data;
   using EncodedImage::set_size;
+  using EncodedImage::SetColorSpace;
   using EncodedImage::SetSpatialIndex;
   using EncodedImage::SetTimestamp;
   using EncodedImage::size;