Add PDM parser (#4234)

Signed-off-by: Pavel Buchart <pavel@buchart.cz>
Signed-off-by: Keith Zantow <kzantow@gmail.com>
Co-authored-by: Keith Zantow <kzantow@gmail.com>

syft/format/internal/spdxutil/helpers/originator_supplier_test.go

@@ -42,6 +42,7 @@ func Test_OriginatorSupplier(t *testing.T) {
 		pkg.PhpPeclEntry{},
 		pkg.PortageEntry{},
 		pkg.PythonPipfileLockEntry{},
+		pkg.PythonPdmLockEntry{},
 		pkg.PythonRequirementsEntry{},
 		pkg.PythonPoetryLockEntry{},
 		pkg.PythonUvLockEntry{},
@@ -342,6 +343,25 @@ func Test_OriginatorSupplier(t *testing.T) {
 			originator: "Person: auth (auth@auth.gov)",
 			supplier:   "Person: auth (auth@auth.gov)",
 		},
+		{
+			name: "from python PDM lock",
+			input: pkg.Package{
+				Metadata: pkg.PythonPdmLockEntry{
+					Files: []pkg.PythonFileRecord{
+						{
+							Path: "",
+							Digest: &pkg.PythonFileDigest{
+								Algorithm: "sha256",
+								Value:     "3d5da6925056f6f18f119200434a4780a94263f10d1c21d032a6f6b2baa20651",
+							},
+						},
+					},
+					Summary: "A test package",
+				},
+			},
+			originator: "",
+			supplier:   "",
+		},
 		{
 			name: "from r -- maintainer > author",
 			input: pkg.Package{