FcmConfig
Create an instance of Firebase Messaging Config.
Parameters
isRegistrationEnabled
true if you want the MoEngage SDK to register for Push else false.
Parameters
senderId
sender-id/project id for the FCM project.
**Sender id is a mandate when you are using Instant apps and MoEngage SDK is
registering for push.**
isRegistrationEnabled
true if you want the MoEngage SDK to register for Push else false.