[hitbtc] Add user's trade history to the generic service

Implement ANXTradeService.getTradeHistory() based on ANXV2.getExecutedTrades():
- price is computed as settlementCurrencyFillAmount/tradedCurrencyFillAmount scaled to 8 decimal places and with rounding to even (not sure if OK) so won't be equal to the one in LimitOrder
- lastId is a timestamp of the first trade in the result (the youngest)