feat: inventory check inspects large fluid containers

[mainrs]

The commit adds the necessary code to check large fluid cells for their liquid content. In these cases, it now generates an instance of LFluidStack instead of LItemStack. This does mean that recipes requiring large fluid stacks filled with a liquid might mis-behave, but I could not find any such recipes. A potential fix to this is to return a Collection<ILabel> instead of a single ILabel from the ILabel.Converter#from method.

I tried that, but I wasn't too sure about the implications on other code parts, so I left it out (there were three places that required changes).

There are also other fluid containers (I think they are from Forestry?) in GTNH, but those are used as normal item ingredients in recipes. Therefore, I didn't add them in this PR. I am also not sure if they can be used to fill machines with their contents.

Fixes #10.

[mainrs]

There is one thing I do not like: I check against the item being an instance of MetaItem.01. But those can be a bunch of items. However, the meta value/damage is not the same during runtime as it is inside the source code. The steel fluid cell has a meta value of 405, but during runtime its 32405. I am not too sure how to handle this properly.
That's why I check for the right item, and then ensure it's a fluid container by checking if it contains a fluid item stack.