Is your feature request related to a problem? Please describe.

InlineKeyboardMarkup and InlineKeyboardButton objects are currently not really testable for equality because the _id_attrs are not set. We should add all attributes of IKB to the _id_attr and inline_keyboard for IKM.

Additional context

We already did that for MessageEntity iirc. Probably should go through the lib and do that for all the telegram objects.

Current workaround

Use __dict__ for everything