Raise exception while accessing rules by index (#4068)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Sorin Sbarnea <[email protected]>

src/ansiblelint/rules/__init__.py

@@ -455,6 +455,9 @@ def __len__(self) -> int:
 
     def __getitem__(self, item: Any) -> BaseRule:
         """Return a rule from inside the collection based on its id."""
+        if not isinstance(item, str):
+            msg = f"Expected str but got {type(item)} when trying to access rule by it's id"
+            raise RuntimeError(msg)
         for rule in self.rules:
             if rule.id == item:
                 return rule