Feature request: Add UPC +2 and +5 barcode extension scanning to ML Kit

[ethanwa]

+2 is used on magazines to denote issue number and on older comic books. +5 is used on comic books to denote printing, variant, and issue number. It's used on books to denote retail price.

Both are often used in other capacities as well, but I won't research to list them all.

I would love to see Google add native support for these barcode extensions. Apple's built-in vision barcode scanner doesn't have either of these, and it would give me a reason to move to Google's ML implementation on both Android and iOS for my apps.

[zhouyiself]

Thanks for the feature request. We'll discuss this internally and come up with a plan, so please stay tuned.