Price is often can be expired, find alternative way to get valid non expired price value

[AndreyMashukov]

Add websocket ping-pong handlers, make Kline provider interface and implement decorator for exchange repository with multi step price calculations

[AndreyMashukov]

https://developers.binance.com/docs/derivatives/coin-margined-futures/websocket-market-streams/Individual-Symbol-Mini-Ticker-Stream