feat(binance): fetchIsolatedBorrowRates

[samgermain]

% py binance fetchIsolatedBorrowRate BTC/USDT
Python v3.9.6
CCXT v4.3.11
binance.fetchIsolatedBorrowRate(BTC/USDT)
{'base': 'BTC',
 'baseRate': 3.424e-05,
 'datetime': None,
 'info': {'data': [{'borrowLimit': '72',
                    'coin': 'BTC',
                    'dailyInterest': '0.00003424'},
                   {'borrowLimit': '900000',
                    'coin': 'USDT',
                    'dailyInterest': '0.00026096'}],
          'leverage': '10',
          'symbol': 'BTCUSDT',
          'vipLevel': '0'},
 'period': 86400000,
 'quote': 'USDT',
 'quoteRate': 0.00026096,
 'symbol': 'BTC/USDT',
 'timestamp': None}

[carlosmiei]

@samgermain next time, please don't forget the tests (I will add them this time)

[samgermain]

@samgermain next time, please don't forget the tests (I will add them this time)

please don't add them if I forget again, let me fix my own mistakes please