Agora RTC Objective-C API Reference Refactor

### - e -

- e2eDelay : AgoraRtcRemoteAudioStats , AgoraRtcRemoteVideoStats
- earMonitorDelay : AgoraRtcLocalAudioStats
- elapsedTime : AgoraVideoRenderingTracingInfo
- enable : AgoraStreamLayerConfig
- enableAlphaMask : AgoraRtcVideoCanvas
- enableAudio : AgoraEchoTestConfiguration
- enableAudioProcessing : AgoraAudioTrackConfig
- enableAudioRecordingOrPlayout : AgoraRtcChannelMediaOptions
- enableBuiltInMediaEncryption : AgoraRtcChannelMediaOptions
- enableCache : AgoraMediaSource
- enableFaceCapture : AgoraMetaSceneConfig
- enableLocalPlayback : AgoraAudioTrackConfig
- enableMultiAudioTrack : AgoraMediaSource
- enableMultipath : AgoraRtcChannelMediaOptions
- enableVideo : AgoraEchoTestConfiguration
- encodeAlpha : AgoraAdvancedVideoOptions
- encodedFrameOnly : AgoraVideoSubscriptionOptions
- encodingPreference : AgoraAdvancedVideoOptions
- encodingType : AgoraAudioEncodedFrameDelegateConfig
- encryptionConfig : AgoraRtmClientConfig
- encryptionKdfSalt : AgoraEncryptionConfig
- encryptionKey : AgoraEncryptionConfig , AgoraRtmEncryptionConfig
- encryptionMode : AgoraEncryptionConfig , AgoraRtmEncryptionConfig
- encryptionSalt : AgoraRtmEncryptionConfig
- end : AgoraRtmGetHistoryMessagesOptions
- endTimeMs : AgoraClimaxSegment
- errorCode : AgoraRtmErrorInfo
- eventDelegate : AgoraMusicContentCenterConfig , AgoraRtcEngineConfig
- eventType : AgoraRtmLockEvent , AgoraRtmStorageEvent
- excludeWindowList : AgoraScreenCaptureParameters
- expectedDownlinkBitrate : AgoraLastmileProbeConfig
- expectedUplinkBitrate : AgoraLastmileProbeConfig
- extensionName : AgoraExtensionContext , AgoraExtensionMetaInfo
- extraInfo : AgoraContentInspectConfig , AgoraMetaBundleInfo , AgoraMetaEnterSceneConfig , AgoraMetaSceneDisplayConfig , AgoraMetaSceneInfo