Deprecate createRuleTester API (#4279)
Deprecate createRuleTester API (#4279)

Co-Authored-By: Ivan Kopeykin <5b500ad544ab44e86832ce53bb26e0c056d48d5c@gmail.com>
stylelint/stylelint,stylelint/stylelint,stylelint/stylelint,stylelint/stylelint