Make the repo commitizen-friendly

[ArturMoczulski]

Add https://github.com/commitizen/cz-cli to repo's dependencies.

Add config for commitizen to use https://www.npmjs.com/package/cz-conventional-changelog

This will provide the git cz command which makes creating conventional-changelog commits easy

This also needs we will need to adjust our contributing instructions for the community

[ijsnow]

Feel free to open a PR for this if it's necessary.