This issue is to track the need to update the webSpeechPonyFillFactory signature so that we can provide a promise that returns both the region and authorizationToken together.

This will be necessary once the BF speech service resources are scaled up to more datacenters outside of westus. Currently, the region is hardcoded in the Emulator.

See PR https://github.com/microsoft/BotFramework-Emulator/pull/1878/files for context.