Detect `event.environment` automatically if not specified in the options

[krystofwoldrich]

Description

We can detect by __DEV__ is RN was build for production or for development/debug we can set the event.environment automatically if not defined in the options.

• context Use same default environment team-mobile#73 (comment)
  • rn sets default production not auto-detection at the moment

[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 🥀