return tags as part of Head/Get calls (#17635)

AWS S3 only returns the number of tag
counts, along with that we must return
the tags as well to avoid another metadata
call to the server.

cmd/handler-utils.go

@@ -38,6 +38,7 @@ import (
 const (
 	copyDirective    = "COPY"
 	replaceDirective = "REPLACE"
+	accessDirective  = "ACCESS"
 )
 
 // Parses location constraint from the incoming reader.