[FR] Add Direct_Boot_OK to AndroidConfig()

[CatrinaFitabase]

Following the instructions to include "direct_boot_ok" : true in the message request body:

https://firebase.google.com/docs/cloud-messaging/send-message#c_3

Some packages such as Python Admin SDK have a direct boot parameter:
https://firebase.google.com/docs/reference/admin/python/firebase_admin.messaging

However, is the .NET SDK does not:
https://firebase.google.com/docs/reference/admin/dotnet/class/firebase-admin/messaging/android-config

Is there another location to pass this parameter or will this be added later?

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