* Add model validation to remove UNSET before field validation
Updated aiogram/types/base.py to include a model validator which removes any 'UNSET' before field validation. This change was necessary to correctly handle `parse_mode` where 'UNSET' is used as a sentinel value. Without the removal of 'UNSET', it would create issues when passed to model initialization from `Bot.method_name`. 'UNSET' was also added to typing. Tiny documentation fix was made.
* Added changelog
* Removed the use of the context instance (Bot.get_current) from all placements that were used previously.
* Fixed tests
* Added changelog
* Change category
* PoC: Mount objects to the Bot instance, bind shortcuts to configured instance
* Fixe docstring of the bind method
* Pass Bot instance explicitly to the URLInputFile
* Added tests
* Added changelog
* Refactor aiogram client and update tests
Refactored base.py to improve code readability by separating response_type operation from model_validate(). Also, adjusted the parameters in URLInputFile() within test_input_file.py for better test coverage. Updated input_file.py to streamline read method and avoid unnecessary instantiation of Bot class. Lastly, adjusted typing in methods/base.py to enhance code clarity.
* Update changelog
Upgrade architecture + 5.0 Bot API (#469)
* Moved `methods`, `types` and `client` to root package
* Removed update handler from routers to dispatcher
* Reworked events propagation mechanism to handlers
* Reworked inner middlewares logic (very small change)
* Updated to Bot API 5.0
* Initial migration from MkDocs to Sphinx + config for readthedocs
