[FEATURE] Enable DebuggerPanel in Production

Hi

What's your thoughts on having an extra ENV variable (maybe REACT_AB_TEST_ENABLE_DEBUGGER_PANNEL) that will enable the debugger panel in production.

If you're setting this then you'll need to run `experimentDebugger.disable();` at the top of your app to disable it.

I'm happy tp send PR - just want to know if it's a desired feature.