[EPIC] Mobile User Feedback

[kahest]

Goal: Implement new User Feedback feature (API, Widget, Screenshots/Attachments, Annotations) for the big 4 Mobile platforms (Apple, Android, RN, Flutter)

Apple: tracked in EPIC getsentry/sentry-cocoa#4187

Preview Give feedback

1. API
2. Widget
3. Screenshots
4. Annotations
5. Docs

Android: tracked in EPIC getsentry/sentry-java#3599

Preview Give feedback

1. API
2. Widget
3. Screenshots
4. Annotations
5. Docs

RN: tracked in EPIC getsentry/sentry-react-native#4302

Preview Give feedback

1. API
2. Widget
3. Screenshots
4. Annotations
5. Docs
6. Report a bug button Implements Report a Bug button sentry-react-native#4378
7. Pull down to cancel
8. Support light/dark theme

Flutter

Preview Give feedback

1. API Support captureFeedback sentry-dart#2230
2. Widget Support captureFeedback sentry-dart#2230
3. Screenshots Add screenshot to SentryFeedbackWidget sentry-dart#2369
4. Annotations
5. Docs
6. Widget customization options
7. Show Screenshot in Widget