[interactive_media_ads] Add support for AdsManager methods pause() and resume() #152255
Description
Use case
Docs for AdsManager:
- Android: https://developers.google.com/interactive-media-ads/docs/sdks/android/client-side/api/reference/com/google/ads/interactivemedia/v3/api/AdsManager
- iOS: https://developers.google.com/interactive-media-ads/docs/sdks/ios/client-side/reference/Classes/IMAAdsManager
Proposal
pause() and resume() are supported on both platform, so both of these methods should be added to the app-facing interface class AdsManager.