Release v2.2.0

What's Changed

• chore: added webrtc versions consts by @Brazol in #49
• SPM support for iOS by @Brazol in #48
• feat: audio playback pause/resume by @Brazol in #50
• fix: audio interruption on android by @Brazol in #51

Full Changelog: stream_webrtc_flutter-v2.0.0...stream_webrtc_flutter-v2.2.0