#5959 feat/ add CI-EX connector

Proposal to submit a connector for CI-EX into the Hummingbot Foundation's open source codebase. The connector is built following the gold standard connector implementation.

Exchange URL : https://ci-ex.com/en_US/ Connector Type : Spot Trading Pull Request : https://github.com/hummingbot/hummingbot/pull/5959

The development work is divided into three parts:

1. Implement CI-EX Order Book Data Source: https://docs.hummingbot.org/developers/connectors/build/
2. Implement CI-EX Exchange Class: https://docs.hummingbot.org/developers/connectors/build/#connector
3. Create a documentation for this connector in https://docs.hummingbot.org/exchanges/