WEBRTC-2635: [Android] WebRTC Stats Exposure on Call Level

[ai-swe-agent]

Description

This PR implements WebRTC stats exposure on call level for the Android SDK, similar to the existing implementation in the JS SDK.

Changes

• Added CallQualityMetrics class to represent real-time call quality metrics
• Added MOSCalculator class to calculate Mean Opinion Score and call quality
• Updated WebRTCReporter to collect and emit call quality metrics
• Updated Call and TelnyxClient classes to support the debug parameter
• Added onCallQualityChange callback for real-time metrics

Usage

When creating an invitation or answering an invitation, you can now pass a debug parameter:

// When making a call
call.newInvite(
    callerName = "John Doe",
    callerNumber = "+1234567890",
    destinationNumber = "+1987654321",
    clientState = "some-state",
    debug = true
)

// When answering a call
call.acceptCall(
    callId = callId,
    destinationNumber = "destination",
    debug = true
)

// Listen for call quality metrics
call.onCallQualityChange = { metrics ->
    // Access metrics.jitter, metrics.rtt, metrics.mos, metrics.quality
    Log.d("CallQuality", "MOS: ${metrics.mos}, Quality: ${metrics.quality}")
}

Related

• JS SDK Implementation
• iOS SDK Implementation

Fixes WEBRTC-2635

[Oliver-Zimmerman]

To be reviewed here:
#516