Added new methods get_attributes, clone, and __iter__
- get_attributes: returns attributes of tag or id
- def get_attributes(self, tagOrId: Union[int, str]) -> Dict
- clone: clones and object
- def clone(self, tagOrId: Union[int, str], *args: List[int]) -> int
- __iter__: returns an iterable of all canvas items
- def __iter__(self) -> iter