Implement dividing amounts to array of fixed one

[Velnbur]

Objective

Implement an algorithm of divining an input sum into fixed-size amounts (e.g. banknotes).

Consideration

For example, 1523 USDT should be divided into 1000, 500, and 20 USDT, so that node implementation could create UTXOs with that amounts and participate in several rooms with that amounts.