Move HUMAN_READABLE_TYPES to constants

[DanielNoord]

• Add yourself to CONTRIBUTORS if you are a new contributor.
• Write a good description on what the PR does.

Type of Changes

	Type
✓	🔨 Refactoring

Description

I'm going to go through the effort of picking some of the changes for #5311 into separate PRs.
I don't see myself being able to keep my focus for 2000+ lines 😄

I'm co-authoring @CarliJoy in all of them as they have done all the work here!

[Pierre-Sassoulas]

There will be a lot to rebase, but this will surely help. I don't know if it's a reasonable use of our time though. The main issue with the other MR is also that a lot of new lines of code were added in two new checkers at once.

[coveralls]

Pull Request Test Coverage Report for Build 1660689174

• 4 of 4 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 93.701%

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Totals
Change from base Build 1658866144:	0.0%
Covered Lines:	14354
Relevant Lines:	15319

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💛 - Coveralls

[DanielNoord]

I'm working on splitting out the move of non-ascii-name next, that can definetly be done in a separate PR. I'll see what I can do afterwards. Doing this PRs also helps with actually checking the changes.

[Pierre-Sassoulas]

Yes we can definitely do a MR for each new checker.

[DanielNoord]

Little bit more annoying than I thought since you can't change the "owner" of a PR. So I can't easily ask questions about things to @CarliJoy. Guess I'll keep working in that PR then.

[Pierre-Sassoulas]

If I were you I would let it go and review one Checker after the other now that the two files are separated. It sure is a pain to review but so is splitting it up then still have to review 😄