RtpTransceiver bindings & requirements for publishing tracks (#39)

- RtpSender
- RtpReceiver
- RtpTransceiver
- RtpParameters
- VideoFrameBuilder
- Interior mutability on c++ side
- Cleanup bindings ( Use #pragma once instead of include guards )
     - webrtc-sys/src/* headers are now used in only one place 
     - Avoid confusion between generated headers and our headers
- AdaptedVideoTrackSource
- Cleanup the workaround with unsupported Vec<Shared<T>>
    - Put everything inside one file

webrtc-sys/include/livekit/rtp_receiver.h

@@ -2,30 +2,51 @@
 // Created by Théo Monnom on 01/09/2022.
 //
 
-#ifndef CLIENT_SDK_NATIVE_RTP_RECEIVER_H
-#define CLIENT_SDK_NATIVE_RTP_RECEIVER_H
+#pragma once
 
 #include <memory>
 
 #include "api/rtp_receiver_interface.h"
+#include "livekit/helper.h"
 #include "livekit/media_stream.h"
+#include "livekit/rtp_parameters.h"
+#include "rust/cxx.h"
 
+namespace livekit {
+class RtpReceiver;
+}
+#include "webrtc-sys/src/rtp_receiver.rs.h"
 namespace livekit {
 
+// TODO(theomonnom): Implement RtpReceiverObserverInterface?
+// TODO(theomonnom): RtpSource
+// TODO(theomonnom): FrameTransformer & FrameDecryptor interface
 class RtpReceiver {
  public:
   explicit RtpReceiver(
       rtc::scoped_refptr<webrtc::RtpReceiverInterface> receiver);
 
-  std::unique_ptr<MediaStreamTrack> track() const;
+  std::shared_ptr<MediaStreamTrack> track() const;
+
+  rust::Vec<rust::String> stream_ids() const;
+  rust::Vec<MediaStreamPtr> streams() const;
+
+  MediaType media_type() const;
+  rust::String id() const;
+
+  RtpParameters get_parameters() const;
+
+  // bool set_parameters(RtpParameters parameters) const; // Seems unsupported
+
+  void set_jitter_buffer_minimum_delay(bool is_some,
+                                       double delay_seconds) const;
 
  private:
   rtc::scoped_refptr<webrtc::RtpReceiverInterface> receiver_;
 };
 
-static std::unique_ptr<RtpReceiver> _unique_rtp_receiver() {
-  return nullptr;  // Ignore
+static std::shared_ptr<RtpReceiver> _shared_rtp_receiver() {
+  return nullptr;
 }
-}  // namespace livekit
 
-#endif  // CLIENT_SDK_NATIVE_RTP_RECEIVER_H
+}  // namespace livekit