Add ability to flatten included dependencies

[kvverti]

Currently, included JIJ dependencies may have nested JIJ. This can result in multiple JIJ dependencies having the same nested JIJ dependency. Loom should include an option to flatten and de-duplicate JIJ dependencies, similar to what Fabric Loader does at mod load time.

This issue is part of a plan to improve depending on Fabric API.

[Pyrofab]

This would definitely be useful for any library, not just Fabric API.

[modmuss50]

I dont think this is currenly an issue with fabric api specifically, it can be manually worked around by being careful with what you include.

It would take a bit of work as it would need a whole chunk of fabric-loaders mod resoultion stuff pulled over.