Pass Signature to registerDerivativeIp

[jacob-tucker]

Right now, if you want to register an IP as a derivative, you must own the underlying NFT. So, if you want to call registerDerivativeIp, you must own the underlying NFT.

This function should support a signature argument where the owner of the NFT can sign, and then someone else can register their IP as derivative.

This way, an Admin of a DApp can pay for the transaction to register its users IP Assets as derivative using the user's signature.

[allenchuang]

@jacob-tucker this sounds like a new improvement feature rather than a bug? Can you elaborate, will help us prioritize on tasks. Thanks!