Provide the API with an asynchronous methods

[BartoszKlonowski]

The goal of this task is to extend the JS API with the access to the asynchronous API on the native side.

The thing is that all calls to the native side of UWP implementation is based on Promises, but they refer to the synchronous Windows OS implementation under the hood. The native API of SignInNativeModule already supports the asynchronous call to Windows OS, but to make it work it is necessary to design the fetch of results of these calls.

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The solution would be to:

• implement the Events which would send the Promise of a scan/device status value
• fire those events on each change of these values, or launch them on user's demand.