Current situation

Telegram currently offers attribute message_id to Message. But this is inconsistent with the rest of their API, e.g. Chat.id, User.id, InlineQuery.id, etc. We can offer a convenience property Message.id which will make it more consistent and make it less prone to errors, e.g. when someone forgets it's message_id and not id.

Proposed change

Add the property id to Message which just returns self.message_id. A similar example can be found here.

A PR for this issue should

• Add a docstring along with a .. versionadded:: 20.0 directive to the function.
• Add an unit test to test_message.py that ensures that this works as expected and is the same as Message.message_id.

Additional Info

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