Add kunstruct impl of Get/SetDataMap, replace Resource.Merge

api/krusty/options.go

@@ -43,6 +43,7 @@ type Options struct {
 }
 
 // MakeDefaultOptions returns a default instance of Options.
+// TODO(#3343): UseKyaml: konfig.FlagEnableKyamlDefaultValue
 func MakeDefaultOptions() *Options {
 	return &Options{
 		DoLegacyResourceSort:   false,