Move profiles from Metadata to the Base Event class

[pagbabian-splunk]

the profiles array of Profile strings is currently in the metadata Metadata object, in the Base Event class. profiles array of Profile objects should be a Classification group attribute, as it defines additional structure for an event class, by imparting attributes. As such it should be at the Base Event class level, along with class_uid et al.

This would be a breaking change and should be considered before GA.