Update Cognitive Services SDK to 1.9.0

[esgraham]

Would like to update the Cognitive Services SDK to 1.9.0 or use the 1.8.0 or greater option when downloading from gradle for Android and Cocoapods for iOS.

Full testing would need to occur on the plugin.

[rozele]

Here's the link to the 1.9 release notes:
https://docs.microsoft.com/en-us/azure/cognitive-services/speech-service/releasenotes

[rozele]

I would just update the plugin. The only reason not to is if we plan to use the JS SDK for Android (I don't think we will) as there are still challenges with using v1.9 JS SDK within an Android WebView.