Gen IR Diagnostic Collection

[NinjaLikesCheez]

When issues occur with Gen IR, we often have to ask for various artifacts from the user - these range from the 'easy' like a debug log, build log, etc to the more tricky like xcode project files, podfiles, etc.

Add a new command 'diagnose' that:

• runs the debug gen-ir and collect it's stdout to a file
• packages artifacts into a folder that can be given to a maintainer for investigation:
  • xcodebuild log
  • project files
  • podfile
  • podspec
• Grabs system information:
  • OS Version
  • Xcode version

Most importantly, be obvious and clear about what is being collected so the user can make an informed choice about what to hand over.