Introduce primer pair searching functionality

This change introduces the `obiprimers` command-line tool and a complete search pipeline for identifying primer pairs. It includes new data structures for pair evaluation, comprehensive search configuration options, and detailed CSV output handling for results.

cmd/obitools/obiprimers/main.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	"os"
+
+	log "github.com/sirupsen/logrus"
+
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obidefault"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obioptions"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obitools/obiconvert"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obitools/obicsv"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obitools/obiprimers"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiutils"
+)
+
+func main() {
+	optionParser := obioptions.GenerateOptionParser(
+		"obiprimers",
+		"designs the primer pairs amplifying a set of example sequences and evaluates the DNA barcode they delimit",
+		obiprimers.OptionSet)
+
+	_, args := optionParser(os.Args)
+
+	if !obidefault.HasSelectedTaxonomy() {
+		log.Fatal("you must indicate a taxonomy using the -t or --taxonomy option")
+	}
+
+	sequences, err := obiconvert.CLIReadBioSequences(args...)
+	if err != nil {
+		log.Fatalf("Cannot open the sequence files: %v", err)
+	}
+
+	pairs, err := obiprimers.CLIPrimerPairs(sequences)
+	if err != nil {
+		log.Fatalf("%v", err)
+	}
+
+	obicsv.CLICSVWriter(obiprimers.PairsToCSVIterator(pairs), true)
+
+	obiutils.WaitForLastPipe()
+}