Add RN default context to docs
Description
Based on https://github.com/getsentry/sentry-react-native/issues/2920#issuecomment-1523586408
Let's inform the user how Sentry SDKs collect modules to include them in events.
What the modules.json is used for?
Similar to https://docs.sentry.io/platforms/android/enriching-events/context/default-context/
Add info about modules.json to docs and others that are not part of Android, iOS and JS docs.
Link docs issue if exists.
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!
"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀