feat: update licenses to including license content when SPDX expressions are unable to be determined (#3366)

---------
Signed-off-by: HeyeOpenSource <opensource@heye-international.com>
Signed-off-by: Christopher Phillips <32073428+spiffcs@users.noreply.github.com>
Co-authored-by: Christopher Phillips <32073428+spiffcs@users.noreply.github.com>

syft/format/syftjson/model/package.go

@@ -51,6 +51,7 @@ type License struct {
 	Type           license.Type    `json:"type"`
 	URLs           []string        `json:"urls"`
 	Locations      []file.Location `json:"locations"`
+	Contents       string          `json:"contents,omitempty"`
 }
 
 func newModelLicensesFromValues(licenses []string) (ml []License) {

syft/format/syftjson/to_format_model.go

@@ -234,6 +234,7 @@ func toLicenseModel(pkgLicenses []pkg.License) (modelLicenses []model.License) {
 			Type:           l.Type,
 			URLs:           urls,
 			Locations:      locations,
+			Contents:       l.Contents,
 		})
 	}
 	return

syft/format/syftjson/to_syft_model.go

@@ -164,6 +164,7 @@ func toSyftLicenses(m []model.License) (p []pkg.License) {
 			Type:           l.Type,
 			URLs:           l.URLs,
 			Locations:      file.NewLocationSet(l.Locations...),
+			Contents:       l.Contents,
 		})
 	}
 	return