Update RN to min 0.82

[rlepinski]

Changes:

• min RN 0.82 : Starting with RN 0.82, they dropped support for the old arch, so we can simplify to the new arch if we drop older versions. Looks like RN 0.83 is coming out on Monday, so its a good opportunity for us to support both 0.82 & 0.83 with the new major version since RN 0.81 will become END OF CYCLE, and older are now unsupported. I believe 0.81 is actually supported just fine but only if new arch is used. 0.82 works fine with the current version, so before deciding on what versions we will support ill see if 0.83 is breaking or not.
• do not include generated code: Removed shipping generated code with the lib and instead just let RN generated on build. This will hopefully make our plugin more resilient to updates in the future. Its recommended by builder bob team to stop shipping generated code.