ReactNative Android README update for sdk 5.9.1

[thinkocapo]

Overview

This PR was opened in order to test the RN and RN Sentry SDK updates by krystofwoldrich, and to run the TDA tests against it. The TDA testing is tracked in sentry-demos/empower#277

• See commands in 'Run Android'
• Not evaluating 'Run iOS' section in this PR. It's old info that will be tested once the RN-Android release are uploaded to Github and TDA is running succesfully on it.
• Moved several Troubleshooting sections to Troubleshooting.md, like 'How to Bootstrap a RN+Sentry App for First Time', so the README is more readable, and it's easier to find the Setup vs Run instructions.
• Updated Version Dependencies for build tools.

[krystofwoldrich]

I have some small suggestions, but overall looks good. 👍

I haven't commented on the todos in trouble shooting as they will be addressed in sentry-demos/empower#277

[krystofwoldrich]

I've noticed one more version with "?".

Thanks for writing all the commands. It's a handy guide.