[SPIKE] Add Code Climate Tool

[virkt25]

Timeboxed 1-2 days

Description/Steps to reproduce

An interesting tool that I think we might benefit from in terms of better code quality. Checks for duplicate code, refactoring possibilities, etc. along with test coverage.

https://codeclimate.com/product/

[dhmlau]

Let's do a spike and to get more information on how it can help us.

[raymondfeng]

-1. There is no free-tier: https://codeclimate.com/quality/pricing/

[sbacem]

Free for open source