Improve firestore rules debug info:
2 features will really improve the debugging of firestore rules:
- Add a "label" parameter to the debug() function to identify the result in the debug log file of the emulator. Right now, only the value is printed, it is very confusing when you have several debug calls...
- Improve the error message returned to the client so we can understand the permission denied. Right now the message contains very little information and it is not helpful a all..,