chore: switch from colors.js to chalk

[zetorama]

PR checklist

• Addresses an existing issue: #0000
• New feature, bugfix, or enhancement
  • Includes tests
• Documentation update

Overview of change:

This PR makes a switch from colors.js dependency to a similar, but modern library chalk. The motivation is to be able to force output coloring when running tslint as a forked process. Such migration allows to just add the environment variable FORCE_COLOR=1.

See also #3144, as it explains why I came to such changes. Both libraries have similar API, so most diff was automated by typescript's refactor ability.

Is there anything you'd like reviewers to focus on?

Note, there is WIP on bundling typescript definitions within chalk. For now, It seems enough to use current version of @types/chalk.

Also, there is still a colors.js mention in yarn.lock. Obviously, It should be gone away when you update tslint version in devDeps.

CHANGELOG.md entry:

chore: switch from colors.js to chalk

[palantirtech]

Thanks for your interest in palantir/tslint, @zetorama! Before we can accept your pull request, you need to sign our contributor license agreement - just visit https://cla.palantir.com/ and follow the instructions. Once you sign, I'll automatically update this pull request.

[adidahiya]

@zetorama let me know if you have any issues signing the CLA?

[zetorama]

Sorry for a long delay.

@adidahiya , I've got "I don't have any problems with it" from my employer. But I have a different kind of question — how can I change my name on the document? (As I use a pseudonym here, on github.)

Thanks.