Agora RTC Objective-C API Reference Refactor

### - f -

- featureName : LiveStreamAdvancedFeature
- fec_action_counter : ILocalUser::ANAStats
- fec_decode_ms : RemoteAudioTrackStats
- fileName : RecorderInfo
- filePath : LogConfig , AudioRecordingConfiguration
- fileRecordingType : AudioRecordingConfiguration
- fileSize : CacheStatistics , RecorderInfo
- fileSizeInKB : LogConfig
- fillAlphaBuffer : ExternalVideoFrame
- firstAudioPacketDuration : RtcStats
- firstAudioPacketDurationAfterUnmute : RtcStats
- firstVideoKeyFrameDecodedDurationAfterUnmute : RtcStats
- firstVideoKeyFramePacketDuration : RtcStats
- firstVideoKeyFramePacketDurationAfterUnmute : RtcStats
- firstVideoKeyFrameRenderedDurationAfterUnmute : RtcStats
- firstVideoPacketDuration : RtcStats
- firstVideoPacketDurationAfterUnmute : RtcStats
- followEncodeDimensionRatio : CameraCapturerConfiguration
- format : ExternalVideoFrame , CameraCapturerConfiguration , PaddedRawPixelBuffer , RawPixelBuffer
- Format : RawPixelBuffer
- fps : DirectCdnStreamingStats , ImageTrackOptions , VideoFormat
- fraction_lost : ILocalUser::LocalAudioDetailedStats
- frame_index : InputSeiData
- frame_length_decrease_counter : ILocalUser::ANAStats
- frame_length_increase_counter : ILocalUser::ANAStats
- frame_render_delay_ms : RemoteVideoTrackStats
- frameLossRate : RemoteVideoStats , RemoteVideoTrackStats
- frameRate : IScreenCaptureSource::VideoCaptureConfig
- framerate : PublisherConfiguration , RtmpStreamingVideoConfiguration
- frameRate : ScreenCaptureParameters
- framerate : SimulcastStreamConfig
- frameRate : VideoEncoderConfiguration
- frames_encoded : LocalVideoTrackStats
- frames_per_buffer : AudioParameters
- framesPerSecond : EncodedVideoFrameInfo
- frameType : EncodedVideoFrameInfo
- frozen_count_200_ms : RemoteAudioTrackStats
- frozen_count_80_ms : RemoteAudioTrackStats
- frozen_rate : RemoteAudioTrackStats
- frozen_rate_by_custom_plc_count : RemoteAudioTrackStats
- frozen_time_200_ms : RemoteAudioTrackStats
- frozen_time_80_ms : RemoteAudioTrackStats
- frozenRate : RemoteAudioStats , RemoteVideoStats , RemoteVideoTrackStats
- frozenRateByCustomPlcCount : RemoteAudioStats
- frozenRatioPercent : WlAccStats