WIP: add MEXC

[zenixls2]

Add support for MEXC exchange. https://m.mexc.com/auth/signup?inviteCode=18RW6 resolves #616

Checklist

Exchange Interface - the minimum requirement for spot trading

• [x] QueryMarkets
• [x] QueryTickers
• [x] QueryOpenOrders
• [x] SubmitOrders
• [x] CancelOrders
• [x] NewStream

Trading History Service Interface - (optional) used for syncing user trading data

• [ ] QueryClosedOrders
• [ ] QueryTrades

Order Query Service Interface - (optional) used for querying order status

• [ ] QueryOrder

Back-testing service - kline data is used for back-testing

• [x] QueryKLines

Convert functions:

• [ ] MarketData convert functions
  • [ ] toGlobalMarket
  • [ ] toGlobalTicker
  • [ ] toGlobalKLine
• [ ] UserData convert functions
  • [ ] toGlobalOrder
  • [ ] toGlobalTrade
  • [ ] toGlobalAccount
  • [ ] toGlobalBalance

Stream

• [ ] UserDataStream
  • [ ] Trade message parser
  • [ ] Order message parser
  • [ ] Account message parser
  • [ ] Balance message parser
• [ ] MarketDataStream
  • [ ] OrderBook message parser (or depth)
  • [ ] KLine message parser (required for backtesting)
  • [ ] Public trade message parser (optional)
  • [ ] Ticker message parser (optional)
• [ ] ping/pong handling.
• [ ] heart-beat hanlding or keep-alive handling.
• [ ] handling reconnect

Database

• [ ] Add a new kline table for the exchange (this is required for back-testing)
  • [ ] Add MySQL migration SQL
  • [ ] Add SQLite migration SQL

Exchange Factory

• [ ] Add the exchange constructor to the exchange instance factory function.
• [ ] Add extended fields to the ExchangeSession struct. (optional)

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