feat: add unicorn/explicit-length-check

BREAKING CHANGE: New rule introduced

.eslintrc.json

@@ -180,6 +180,7 @@
     "unicorn/custom-error-definition": "error",
     "unicorn/error-message": "error",
     "unicorn/escape-case": "error",
+    "unicorn/explicit-length-check": "error",
     "unicorn/new-for-builtins": "error",
     "unicorn/no-hex-escape": "error",
     "unicorn/no-instanceof-array": "error",