cli: enable invoice for UDA

[zoedberg]

Currently via CLI it's not possible to create an invoice to receive a UDA.

@crisdut could you please take care of this?

[crisdut]

@crisdut could you please take care of this?

Yes!

[zoedberg]

@crisdut any news on this?

[crisdut]

@crisdut any news on this?

I'm having a hard time finding the time to do this, but give me a few days and I'll do it.

[dr-orlovsky]

@zoedberg what are the specific requirements to create an UDA invoice via the cli?

[zoedberg]

@zoedberg what are the specific requirements to create an UDA invoice via the cli?

If we detect that the user is creating an invoice to receive an UDA contract then we should call RgbInvoiceBuilder::set_allocation_raw instead of RgbInvoiceBuilder::set_amount_raw. And Command::Invoice should ignore value or make it optional

[dr-orlovsky]

The last three commits in #248 are now do the NFT (and all other forms) of invoicing, closing this issue.

I first tried to do it as a dedicated PR, but it was not possible since I needed a lot of stuff I did in the develop branch already, so I just added those things on top.