Feature Request : Change the way unit test results are parsed to use Xcode result bundle

Similar to Fastlane trainer (https://github.com/fastlane-community/trainer)

We have observed that the code summary doesn't post the correct unit test results to PR. Currently, it looks like the method of parsing xcpretty logs for unit tests is broken. 

I would like to take a crack at this. either as part of this plugin or as a stand-alone.