feat: added audio capture for ios broadcast screensharing mode

[greenfrvr]

💡 Overview

Added audio capturing for iOS broadcast screen sharing type.
Note: if third party app uses exclusive playback category, the call's audio session is interrupted → mic capture stops → nothing is mixed/sent.

📝 Implementation notes

Added AudioUploader which works similar to SampleUploader: it sends bytes data via socket connection. Server is started on webrtc side. Bytes chunks are accumulated and pushed to ring buffer as they are ready. Audio mixing part stays as is (as it was for in-app audio capturing).

🎫 Ticket: https://linear.app/stream/issue/RN-416/ios-broadcast-screen-sharing-audio-capturing

📑 Docs: https://github.com/GetStream/docs-content/pull/1457

Corresponding WebRTC PR: GetStream/react-native-webrtc#58

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[github-actions]

Bundle size

Built package output. Sizes in KB; delta vs main@4fe5c40.

No significant package size increase vs main.