Add Inlock Tokenmarket support

[prt1999]

• Support REST API only

• Support on OrderBook, Ticker

  Web: https://inlock.io Public API Doc: https://app.swaggerhub.com/apis/IncomeLocker/Inlock_Public_Tokenmarket_API/ Private API Doc: https://app.swaggerhub.com/apis-docs/IncomeLocker/inlock_retail_api/

Description of code - what bug does this fix / what feature does this add?

• [x] - Tested
• [ ] - Changelog updated
• [ ] - Tests run and pass
• [ ] - Flake8 run and all errors/warnings resolved
• [x] - Contributors file updated (optional)

[bmoscon]

@prt1999 can you add some very simple test cases for the public REST endpoints you implemented?

[prt1999]

I will review and fix the code.

[bmoscon]

no response, closing