Flutter Integrate OneSignal Push Notification

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First step: Get iOS cert (mobileprovision + .p12)

NOTE: iOS emulator can NOT get push notification

Config on website

• Login to https://console.firebase.google.com/
• Create a new project
• At Project Overview -> Go to Project settings -> Cloud Messaging
• Copy Server key and Sender ID which keys use to register on OneSignal
• Create new OneSignal account and go to…