feat: video publishing (#42)

- Prepare webrtc abstraction ( for future wasm support )
- Added track publish support for videos
  - Added LogoTrack example to simple_room demo
- Lot of cleanup
- There are compiler warnings I'll solve on our v1 release

livekit-webrtc/src/native/mod.rs

@@ -0,0 +1,48 @@
+pub mod data_channel;
+pub mod ice_candidate;
+pub mod media_stream;
+pub mod peer_connection;
+pub mod peer_connection_factory;
+pub mod rtp_parameters;
+pub mod rtp_receiver;
+pub mod rtp_sender;
+pub mod rtp_transceiver;
+pub mod session_description;
+pub mod video_frame;
+pub mod video_source;
+pub mod video_stream;
+pub mod yuv_helper;
+
+use crate::MediaType;
+use crate::{RtcError, RtcErrorType};
+use webrtc_sys::rtc_error as sys_err;
+use webrtc_sys::webrtc as sys_rtc;
+
+impl From<sys_err::ffi::RTCErrorType> for RtcErrorType {
+    fn from(value: sys_err::ffi::RTCErrorType) -> Self {
+        match value {
+            sys_err::ffi::RTCErrorType::InvalidState => Self::InvalidState,
+            _ => Self::Internal,
+        }
+    }
+}
+
+impl From<sys_err::ffi::RTCError> for RtcError {
+    fn from(value: sys_err::ffi::RTCError) -> Self {
+        Self {
+            error_type: value.error_type.into(),
+            message: value.message,
+        }
+    }
+}
+
+impl From<MediaType> for sys_rtc::ffi::MediaType {
+    fn from(value: MediaType) -> Self {
+        match value {
+            MediaType::Audio => Self::Audio,
+            MediaType::Video => Self::Video,
+            MediaType::Data => Self::Data,
+            MediaType::Unsupported => Self::Unsupported,
+        }
+    }
+}