Add `--nul-output|-0` flag to separate element with NUL character (#1550)

This is to ensure solid parsing of complex data (with any binary
content except NUL chars) by separating the `yq` root collection
member's output with NUL char. As a safe-guard, an error will be cast
if trying to use NUL character with content that contains itself NUL
characters inside.

cmd/evaluate_all_command.go

@@ -90,6 +90,9 @@ func evaluateAll(cmd *cobra.Command, args []string) (cmdError error) {
 	}
 
 	printer := yqlib.NewPrinter(encoder, printerWriter)
+	if nulSepOutput {
+		printer.SetNulSepOutput(true)
+	}
 
 	if frontMatter != "" {
 		frontMatterHandler := yqlib.NewFrontMatterHandler(args[0])