Feat/Add Bit.com Exchange Connector

This PR create BitCom Perpetual connector to the latest coding standards.

BIT Crypto Exchange url: https://www.bit.com/

About BIT

BIT is a full-featured cryptocurrency exchange that is designed for use by professionals, with advanced risk management and fund efficiency supported by Portfolio Margin and Unified Margin.

BIT was launched in August 2020 as an affiliate of Matrixport, a prominent crypto financial service company. BIT is one of the top crypto options trading platforms which offer innovative USD-margined trading pairs.

BIT is always striving to enhance its trading tools, inspire the creation of innovative financial products, and widen its selection of tokens.

Link to PR: https://github.com/hummingbot/hummingbot/pull/6154