Update deep linking documentation and bump version to 3.19.0

CHANGES/1493.bugfix.rst

@@ -1 +0,0 @@
-Fix handling of default empty string ("") in CallbackData filter

CHANGES/1592.misc.rst

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-Introduce Union types for streamlined type handling.
-
-Implemented Union types across various modules to consolidate and simplify type annotations.
-This change replaces repetitive union declarations with reusable Union aliases,
-improving code readability and maintainability.

CHANGES/1637.feature.rst

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-Add TypedDict definitions for middleware context data to the dispatcher dependency injection docs.
-
-So, now you can use :class:`aiogram.dispatcher.middleware.data.MiddlewareData` directly or
-extend it with your own data in the middlewares.

CHANGES/1641.bugfix.rst

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-Resolved incorrect ordering of registered handlers in the :class:`aiogram.fsm.scene.Scene`
-object caused by :code:`inspect.getmembers` returning sorted members.
-Handlers are now registered in the order of their definition within the class,
-ensuring proper execution sequence, especially when handling filters with different
-levels of specificity.
-
-For backward compatibility, the old behavior can be restored by setting the
-:code:`attrs_resolver=inspect_members_resolver` parameter in the :class:`aiogram.fsm.scene.Scene`:
-
-.. code-block:: python
-
-    from aiogram.utils.class_attrs_resolver import inspect_members_resolver
-
-
-    class MyScene(Scene, attrs_resolver=inspect_members_resolver):
-
-In this case, the handlers will be registered in the order returned by :code:`inspect.getmembers`.
-
-By default, the :code:`attrs_resolver` parameter is set to :code:`get_sorted_mro_attrs_resolver` now,
-so you **don't need** to specify it explicitly.

CHANGES/1648.feature.rst

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-Added new method to utils/deep_linking.py module to creating "startapp" deep links, see also 
-https://core.telegram.org/api/links#main-mini-app-links

CHANGES/1650.doc.rst

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-Updated 🇺🇦Ukrainian docs translation

CHANGES/1651.feature.rst

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-Updated "create_startapp_link" method, added app_name param for support direct mini app links, see 
-also https://core.telegram.org/api/links#direct-mini-app-links