Bybit: transfer
Bybit: transfer

Added the transfer method to Bybit:
```
bybit.transfer (USDT, 15, spot, swap)
2022-07-21T20:05:34.579Z iteration 0 passed in 345 ms

{
  id: '3976014d-f3d2-4843-b3bb-1cd006babcde',
  timestamp: undefined,
  datetime: undefined,
  currency: 'USDT',
  amount: 15,
  fromAccount: 'spot',
  toAccount: 'swap',
  status: 'ok'
}
2022-07-21T20:05:34.579Z iteration 1 passed in 345 ms
```

ccxt/ccxt,ccxt/ccxt,ccxt/ccxt,ccxt/ccxt,ccxt/ccxt