Overlapping results of entity-ruler recognizers are ignored

[langhabel]

If two recognizers using the EntityRulerBackend identify the same (or overlapping) token/span as entity, only the first one to be identified is stored. This may give the wrong entity priority, i.e. the one that comes first in the pipeline and not the larger one or the one with the higher score. The reason behind this is the spaCy pipeline allowing tokens/spans to have at most one entity.