Add attribution and the text of their license at the top of the file

[marandaneto]

Example https://github.com/getsentry/sentry/blob/master/src/sentry/db/models/fields/jsonfield.py

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1. Open source attribution to adapted repos sentry-dart#1351
   +0
2. Open source attribution to adapted repos sentry-dart-plugin#92
   +0
3. Check derived source code sentry-cocoa#2844
   Platform: Cocoa +1
   
4. Fix open source attributions sentry-fastlane-plugin#193
   Platform: Cocoa Status: Backlog +2
5. Add attribution and the text of their license at the top of the file sentry-java#2619
   Platform: Android Platform: Java +2
   
6. Add attribution and the text of their license at the top of the file sentry-android-gradle-plugin#453
   Effort: Small Impact: Small Platform: Android +3
7. Add attribution and the text of their license at the top of the file sentry-react-native#2922
   Effort: Small Impact: Small Platform: React-Native Status: Backlog +4