add more status enum for LedgerRecord; add auto_size in FuturesOrder

support total balance API

fix incorrect withdrawal address field

release 6.21.5

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

add order book update ts and cross margin account history

add spot cross margin API

fix invalid auto repay enum values

add spot auto order API; trade time in spot currency pair

add margin auto repay; support transferring to sub user's futures acc…

…ount

add position close pagination, futures order book id, /wallet/fee and…

… withdrawal chain support