Issue description: Milk can go into a fluid disk but cannot be used in a crafting pattern or be put in a detector directly (only milk in a bucket works, not the fluid "milk")

What happens: Nothing

What you expected to happen: I expect to use milk like other fluids

Steps to reproduce:

1. Try to make a detector emit a redstone signal when you have 1 MB of milk
2. Try to create a pattern to put 1 B of milk + 1 bucket for 1 bucket of milk

Version (make sure you are on the latest version before reporting):

• Minecraft: 1.15.2
• Forge: 31.1.74
• Refined Storage: 1.8.3

Does this issue occur on a server? [yes/no] yes

If a (crash)log is relevant for this issue, link it here:

[pastebin/gist/etc link here]

https://github.com/ValhelsiaTeam/Valhelsia/issues/16

The vanilla milk bucket does not extend ItemBucket. As such Forge's fluidhandler cannot get the fluid that is inside the bucket.

Industrial Foregoing by default replaces the Milk Bucket but that one is missing the FLUID_HANDLER_ITEM_CAPABILITY.

Reported here: InnovativeOnlineIndustries/Industrial-Foregoing#792