The ADF EMG Audit Rules are now available on JDeveloper 12.2.1. I want to thanks to Alexis López for reminding me and helping me out!
If you go to Check for Updates, make sure you tick the 'Open Source and Partners Extensions' and click next:
You should see the 'ADF EMG Audit Rules' appear, tick them and click next:
Wait for the download and install, you should see the ADF EMG Audit Rules being installed:
Restart JDeveloper and you are good to go, happy coding!