support msrc types

Signed-off-by: Alfredo Deza <adeza@anchore.com>

syft/pkg/type.go

@@ -18,6 +18,7 @@ const (
 	JenkinsPluginPkg Type = "jenkins-plugin"
 	GoModulePkg      Type = "go-module"
 	RustPkg          Type = "rust-crate"
+	KbPkg            Type = "msrc-kb"
 )
 
 // AllPkgs represents all supported package types
@@ -32,6 +33,7 @@ var AllPkgs = []Type{
 	JenkinsPluginPkg,
 	GoModulePkg,
 	RustPkg,
+	KbPkg,
 }
 
 // PackageURLType returns the PURL package type for the current package.