Fix: unmarshal key values in Java, Go, and Conan metadata (#2603)

Previously, Syft represented several metadata fields as map[string]string,
however this representation erased ordering, so Syft now represents these values
as []KeyValue. Add custom unmarshaling so that JSON that was written by
older versions of Syft using the map[string]string representation can be parsed
into the new []KeyValue representation.

Signed-off-by: Will Murphy <will.murphy@anchore.com>

syft/file/cataloger/executable/cataloger.go

@@ -6,6 +6,7 @@ import (
 	"debug/macho"
 	"encoding/binary"
 	"fmt"
+	"sort"
 
 	"github.com/bmatcuk/doublestar/v4"
 	"github.com/dustin/go-humanize"
@@ -28,8 +29,10 @@ type Cataloger struct {
 }
 
 func DefaultConfig() Config {
+	m := mimetype.ExecutableMIMETypeSet.List()
+	sort.Strings(m)
 	return Config{
-		MIMETypes: mimetype.ExecutableMIMETypeSet.List(),
+		MIMETypes: m,
 		Globs:     nil,
 	}
 }