feat: add SimplifiableIfMatchViolation for single-case matches#3559

SoulSniper1212 wants to merge 2 commits intowemake-services:masterwemake-services/wemake-python-styleguide:masterfrom

SoulSniper1212:fix-issue-3528-prefer-if-over-match-with-single-caseSoulSniper1212/wemake-python-styleguide:fix-issue-3528-prefer-if-over-match-with-single-caseCopy head branch name to clipboard