chore: Skip type checing for getters of required attributes

We can't use TypedDict here becuase it does not allow for arbitrary keys which we need in order to support custom extension attributes.

Signed-off-by: Tudor Plugaru <[email protected]>

Author: PlugaruT

src/cloudevents/core/v1/event.py

@@ -223,31 +223,31 @@ def get_id(self) -> str:
 
         :return: The ID of the event.
         """
-        return self._attributes["id"]
+        return self._attributes["id"]  # type: ignore
 
     def get_source(self) -> str:
         """
         Retrieve the source of the event.
 
         :return: The source of the event.
         """
-        return self._attributes["source"]
+        return self._attributes["source"]  # type: ignore
 
     def get_type(self) -> str:
         """
         Retrieve the type of the event.
 
         :return: The type of the event.
         """
-        return self._attributes["type"]
+        return self._attributes["type"]  # type: ignore
 
     def get_specversion(self) -> str:
         """
         Retrieve the specversion of the event.
 
         :return: The specversion of the event.
         """
-        return self._attributes["specversion"]
+        return self._attributes["specversion"]  # type: ignore
 
     def get_datacontenttype(self) -> Optional[str]:
         """