evaluate_seqs: add optional input of FeatureData[Taxonomy] for labeling features

[nbokulich]

Improvement Description
add optional input for FeatureData[Taxonomy] corresponding to the reference sequences, so the user can see what the taxonomy of the best matches is.

Comments
this could be useful with larger values of max-accepts, as it lets the user see to what extend the best matching alignments share their taxonomic annotation (i.e., they can evaluate the "consensus taxonomy" on their own, which is something we want to encourage for features of interest)