futures delivery candlesticks support more intervals

add withdrawl and deposit fee; add spot currency fixed rate

spot order add fok support

add options API and currency chains API

fix incorrect data type in SpotPriceTriggeredOrder

spot public trades supports time range query

add new status enum in LedgerRecord; add auto_size in FuturesOrder

support total balance API

fix incorrect withdrawal address field

release 4.21.5

1. You can set currency_pair as empty string for finished orders or trades query
2. Add margin and cross margin max transferable API support
3. Add futures position closes history query with time range support
4. Add withdraw fees on multiple chains