Add 'Client Reports' to the React Native SDK

[bruno-garcia]

Sentry's protocol now offers a way to report counts and reason to why data gets dropped.

The JavaScript SDK already has support so the challenge here is to include events dropped in the React Native layers with the rest of the SDKs involved (JS and native).

Spec: https://develop.sentry.dev/sdk/client-reports/

This was implemented in other places that can be used as a reference:

• JavaScript: feat(browser): Client Report Support  sentry-javascript#3955
• Python: feat(transport): Client Report Support sentry-python#1181
• Relay: feat(client-reports): Protocol support for client reports  relay#1074

This will also be implemented in the following SDKs so collaborating with folks adding support there is ideal

• .NET: Add 'Client Reports' to the .NET SDK sentry-dotnet#1455
• Dart: Add 'Client Reports' to the Dart SDK sentry-dart#735
• Java: Add 'Client Reports' to the Java and Android SDKs sentry-java#1894
• Apple: Add 'Client Reports' to the Apple SDK sentry-cocoa#1655

Please close this once done: https://getsentry.atlassian.net/browse/MOBILE-210

[github-actions]

This issue has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you label it Status: Backlog or Status: In Progress, I will leave it alone ... forever!

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"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀