feat: update syft license concept to complex struct (#1743)

this PR makes the following changes to update the underlying license model to have more expressive capabilities
it also provides some guarantee's surrounding the license values themselves

- Licenses are updated from string -> pkg.LicenseSet which contain pkg.License with the following fields:
- original `Value` read by syft
- If it's possible to construct licenses will always have a valid SPDX expression for downstream consumption
- the above is run against a generated list of SPDX license ID to try and find the correct ID
- SPDX concluded vs declared is added to the new struct
- URL source for license is added to the new struct
- Location source is added to the new struct to show where the expression was pulled from

schema/json/generate.go

@@ -78,7 +78,6 @@ func build() *jsonschema.Schema {
 	}
 	documentSchema := reflector.ReflectFromType(reflect.TypeOf(&syftjsonModel.Document{}))
 	metadataSchema := reflector.ReflectFromType(reflect.TypeOf(&artifactMetadataContainer{}))
-
 	// TODO: inject source definitions
 
 	// inject the definitions of all metadatas into the schema definitions