Adds support for drawable resources to AndroidNotification

[aMarCruz]

@chrisbianca ,

Currently, RNF does not support drawable resources for images passed to the setBigPicture and setLargeIcon methods of AndroidNotification. On the other hand, RN does not support mipmap resources as Image.source uri, which means duplicating these resources in both folders.

The icon in this notification is set through .android.setLargeIcon('ai_medical') (mipmap resource):

This icon in this card is set by Image source={ uri: ic_medical } (drawable resource):

This commit adds support for "drawable" to the setBigPicture and setLargeIcon methods.

Not sure if RN determine the correct folder/size of the result, but at least BitmapFactory.decodeResource (getResources(), drawableId) can decode drawables (I don't know how you make a test for this).

Environment

Platform: Android
Development Operating System: Linux Mint 18.3
Build Tools: Android Studio 3.2, Android SDK 27
React Native version: 0.55.4
RNFirebase Version: 4.2
Firebase Module: notifications

[chrisbianca]

Good spot, thank you!

[Salakar]

@aMarCruz thanks for this, this is now live in the v4.3.0 release.

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