test: split tests of large validators

[WikiRik]

Like in #2159 this PR splits tests of validators to their separate files. Based on https://github.com/validatorjs/validator.js/pull/2159#pullrequestreview-1288528413 this PR tackles validators that have > 100 loc. Only isMobilePhone was not done here because of the 50+ open PRs for it.

I also ran prettier on the split test files so there are some styling changes.

Checklist

• [X] PR contains only changes related; no stray files, etc.
• [X] README updated (where applicable)
• [X] Tests written (where applicable)
• [X] References provided in PR (where applicable)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.96%. Comparing base (0a39bb7) to head (b564f40).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2541   +/-   ##
=======================================
  Coverage   99.96%   99.96%           
=======================================
  Files         113      113           
  Lines        2527     2527           
  Branches      641      641           
=======================================
  Hits         2526     2526           
  Partials        1        1           

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[WikiRik]

Had to fix merge conflicts in regards to the recently merged isPostalCode changes