refactor: refactor cli

[fisker]

• Separate features into different functions, so we can easily exit.
• Use process.exitCode instead of process.exit()
• Change exit code to 1 (file not sorted) and 2 (fatal errors)
• Update husky and lint-staged setup
• Minor tweak to the help information

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Q: Should we consider breaking change for changing the exit code?

[github-actions[bot]]

:tada: This PR is included in version 2.4.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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