add support for priced content

[nikooo777]

Some content publishers want to have their videos published for a price.
For this reason ytsync must fetch the following parameters from the API: fee_amount, fee_currency, fee_address and then supply them when calling the publish method.
This issue depends on the implementation on the API side first.

[tzarebczan]

We recently synced some content without a price for a creator who was promised we'd sync at 1 LBC.

[nikooo777]

and I agree that's a problem. I will try to get this in my next sprint

[alyssaoc]

Issue moved to lbryio/ytsync #6 via ZenHub