OKX- Add OKX Spot Candles Feed

[nikspz]

Description

• Add a new Candles Feed for the OKX spot connector
• Should implement the CandlesBase class like the Binance Perpetual candles.
• Support web sockets to stream new messages and rest to collect historical data
• Contains unit tests and meets % coverage requirements
• You can find the candles feed inside hummingbot/data_feed/candles_feed
• See https://www.okx.com/docs-v5/en/ for API reference

Bounty

• Sponsor: HB Foundation connector pots
• Bounty amount: 100k HBOT or 200 USDC
• Developer portion: 100k HBOT or 200 USDC

[tomasgaudino]

hey! i'd like to take this one please!

[nikspz]

Assigned to @tomasgaudino , please be informed:

• Since you’re assigned to this bounty exclusively, please keep us informed on your progress over the next few days
• Please review and follow contribution guidelines (https://hummingbot.org/developers/contributions/)
• Please review the checklist after PR submitted (https://hummingbot.org/developers/contributions/#checklist)
• Let us know if you don’t have time, and we will unassigned and keep it open for other devs
• Only one dev can be assigned to one bounty

Thanks for your contribution!

[tomasgaudino]

here's the pr #7022, if you have any questions or something feel free to reach me!