Add BTC Markets spot candles feed implementation

Title

This PT proposes a change which will add candle data retrieval from the BTC Markets api. This will allow for back-testing strategies using candle data feed associated with the BTC Markets spot connector.

Summary

This PT proposes a change which will add candle data retrieval from the BTC Markets api. This will allow for back-testing strategies using candle data feed associated with the BTC Markets spot connector.

Rationale

This implementation provides historical candle data for BTC Markets exchange following the Hummingbot candles feed architecture. Note: WebSocket is not supported as BTC Markets doesn't provide real-time candle streaming via WebSocket. There was also a request to add this functionality from a community member on discord.

Github Link

https://github.com/hummingbot/hummingbot/pull/7670