Store raw exchanges data

[vbloher]

implement a module that will save trades from the kafka topics and snapshots of orderbooks

[vbloher]

• [x] new module
• [x] save trades
• [x] save order book snapshots (default period - 10 min)
• [x] refactor architecture of exchanges-connector for sharding by exchanges
• [x] api for raw data
• [x] deploy to gcloud
• [x] update docs

[vbloher]

Api definitions link: https://app.swaggerhub.com/apis/vstavetski6/cyber-markets_api/1.0.0#/exchange/getExchangeInfo