SDK should disable idle timer during active broadcast/publish sessions

[noais]

Description:

When using AgoraRtcEngineKit in .liveBroadcasting channel profile with .broadcaster role, the SDK does not set
UIApplication.shared.isIdleTimerDisabled = true during active publishing.

This means the device screen dims and eventually locks mid-livestream, which interrupts the broadcast from the user's perspective. That's why screen went to power save mid-recording.

Expected behavior:
The SDK should automatically disable the idle timer when:

• The client role is .broadcaster
• The client has joined a channel and is actively publishing audio/video

And re-enable it when:

• The client leaves the channel
• The client stops publishing (mute both streams)
• The client role changes to .audience

Current behavior:
The idle timer is never managed by the SDK. The host app must manually toggle isIdleTimerDisabled, which is easy to miss and causes a poor user
experience when the screen locks during a live broadcast.

Workaround:
// When going live
UIApplication.shared.isIdleTimerDisabled = true

// When stopping
UIApplication.shared.isIdleTimerDisabled = false

Environment:

• Agora SDK: v4.6.0 (AgoraRtcKit)
• Platform: iOS 17+
• Channel profile: .liveBroadcasting
• Client role: .broadcaster

Additional context:
Other media SDKs (e.g. AVCaptureSession-based apps) commonly handle this automatically. Since Agora fully manages the camera/mic pipeline once
enableVideo()/enableAudio() are called, it would be consistent for the SDK to also manage screen sleep during active sessions. An opt-out flag
(e.g. AgoraRtcEngineConfig.manageIdleTimer) would preserve flexibility for apps that want custom behavior.