Add poetry cataloger (#121)

* Minor cleanup

Signed-off-by: Dan Luhring <dan.luhring@anchore.com>

* Update pkg Type definition to string

Signed-off-by: Dan Luhring <dan.luhring@anchore.com>

* Implement poetry.lock parsing

Signed-off-by: Dan Luhring <dan.luhring@anchore.com>

* Address CI issues

Signed-off-by: Dan Luhring <dan.luhring@anchore.com>

* Integrate Alex's changes

Signed-off-by: Dan Luhring <dan.luhring@anchore.com>

syft/presenter/json/presenter.go

@@ -94,7 +94,7 @@ func (pres *Presenter) Present(output io.Writer) error {
 		art := artifact{
 			Name:     p.Name,
 			Version:  p.Version,
-			Type:     p.Type.String(),
+			Type:     string(p.Type),
 			Sources:  make([]source, len(p.Source)),
 			Metadata: p.Metadata,
 		}

syft/presenter/table/presenter.go

@@ -31,7 +31,7 @@ func (pres *Presenter) Present(output io.Writer) error {
 		row := []string{
 			p.Name,
 			p.Version,
-			p.Type.String(),
+			string(p.Type),
 		}
 		rows = append(rows, row)
 	}

syft/presenter/text/presenter.go

@@ -52,7 +52,7 @@ func (pres *Presenter) Present(output io.Writer) error {
 	for _, p := range pres.catalog.Sorted() {
 		fmt.Fprintln(w, fmt.Sprintf("[%s]", p.Name))
 		fmt.Fprintln(w, " Version:\t", p.Version)
-		fmt.Fprintln(w, " Type:\t", p.Type.String())
+		fmt.Fprintln(w, " Type:\t", string(p.Type))
 		fmt.Fprintln(w, " Found by:\t", p.FoundBy)
 		fmt.Fprintln(w)
 		w.Flush()