TradeInterface - Define and implement a method to place multiple orders in parallel

[Desrever Nu]

This ticket is an evolution of #804, where multiple orders are submitted sequentially one by one.

To make the whole process faster, the bot should split the list orders in sub-groups and delegate their execution to a different process/thread in parallel.

To avoid collisions in term of nonces, cautionary measures need to be undertaken. One of the most efficient strategy would be to have multiple (N) independent apikeys pairs associated to N exchange account. This change would be non-trivial and aggregated liquidity should be taken into account across accounts.