Reduce memory reallocation in FirebasePushNotificationSender

[bierquelle06]

....\src\AdsPush.Firebase\FirebasePushNotificationSender.cs

Object Instantiation within Loops:
In the SendBatchNotificationAsync method, you are creating multiple instances of FirebaseNotificationResult within a loop, using the CreateUsingFirebaseSendResponse method.

Recommendation: If you expect to have a large number of notifications and responses, consider using a more efficient data structure like a List with preallocated capacity. This can help reduce memory reallocation overhead during list growth.