FTX: Adding WebSocket channel and Rest requests

[Fenrur]

Ftx:

• Adding FillUpdateChannel websocket user channel
• Adding DeleteTriggerOrder user rest request
• Adding GetAllSubAccounts user rest request
• Adding GetBorrowHistory user rest request
• Adding GetBorrowRates user rest request
• Adding GetDailyBorrowedAmounts user rest request
• Adding GetFundingPayments user rest request
• Adding GetFutureStats user market request
• Adding GetLendingHistory user rest request
• Adding GetLendingInfo user rest request
• Adding GetLendingOffers user rest request
• Adding GetLendingRates user rest request
• Adding GetOptionOpenInterest market rest request
• Adding GetSingleMarket user rest request
• Adding ModifyOrders user rest request
• Adding ModifyOrdersByClientId user rest request
• Adding PostAcceptQuote user rest request
• Adding PostRequestQuote user rest request
• Adding PostTransferBetweenSubAccounts user rest request
• Adding PostTriggerOrder user rest request
• Adding SubmitLendingOffer user rest request