Adds possibility to extract a taxonomy from taxonomic path included in sequence files

pkg/obiseq/biosequenceslice.go

@@ -1,6 +1,7 @@
 package obiseq
 
 import (
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obitax"
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiutils"
 	log "github.com/sirupsen/logrus"
 	"golang.org/x/exp/slices"
@@ -179,3 +180,18 @@ func (s *BioSequenceSlice) SortOnLength(reverse bool) {
 		}
 	})
 }
+
+func (s *BioSequenceSlice) ExtractTaxonomy(taxonomy *obitax.Taxonomy) (*obitax.Taxonomy, error) {
+	var err error
+
+	for _, s := range *s {
+		taxonomy, err = taxonomy.InsertPathString(s.Path())
+
+		if err != nil {
+			return nil, err
+		}
+
+	}
+
+	return taxonomy, nil
+}