Dont track inventory for a bundle about spree-product-assembly

[GeekOnCoffee]

I think this should be configurable, my old company tracked inventory both on individual components and kits, and used internal processes to get additional kits made when the kit inventory was depleted.

[Allanon29]

I agree that it should be configurable.

[smartacus]

We ran into this issue as part of our Spree 2.4 update. Our current line of thinking is that we'll use the track inventory flag on the assembly to determine whether inventory is tracked on the assembly itself or on its parts.

Does this sound like a viable option?

[huoxito]

sounds reasonable to me @smartacus, btw planning to look at your 2.4 support PR this weekend, after it's merged feel free to submit another patch with what you suggested here.