Introduce severity of EvaluationType by profile

[cgendreau]

Currently EvaluationType doesn't provide the severity of any of its elements (even if it's possible to get the default one for the flags related to Occurrences).

The idea is to map EvaluationType to a severity based on a ValidationProfile. For example, a Geodetic datum assumed WGS84 could be a warning in the default GBIF profile but an error in the context of a BID project.

Note that the concept of ValidationProfile refers to a profile in the context of new or updated data that will be shared/updated through GBIF. It is not referring to the concept of Fitness For Use of data after a download even if the 2 concepts are not mutually exclusive.