Trailing Stop orders implementation

[cjdsellers]

Enhancement

The trailing stop order types need to be implemented for the SimulatedExchange:

• TRAILING_STOP_MARKET
• TRAILING_STOP_LIMIT

They will also need to be implemented for each adapter which can support them, which is highly specific to an integrations API. For instance how Binance and FTX handle trailing stops is quite different, however once the exchanges updates are translated into Nautilus events, the order will update in the same way.