Function rgb20::issue

pub fn issue(
    chain: Chain, 
    ticker: String, 
    name: String, 
    description: Option<String>, 
    precision: u8, 
    allocation: Vec<(OutPoint, AtomicValue)>, 
    inflation: BTreeMap<OutPoint, AtomicValue>, 
    renomination: Option<OutPoint>, 
    epoch: Option<OutPoint>
) -> Result<(Asset, Genesis), Error>