Added full support of Bot API 7.2 (#1444)

* Added base support of Bot API 7.2

* Added base support of Bot API 7.2

* Fixing tests and content types for Telegram Bot API 7.2 update (#1453)

* Fixing tests and content types for Telegram Bot API 7.2

* Adding changelog for 1453 PR

* Fixes + coverage

* Replace `BusinessConnection.date` type

* Reformat code

* Refactor UserContextMiddleware to use EventContext class

This update significantly refactors UserContextMiddleware to leverage a new class, EventContext. Instead of resolving event context as a tuple, it now produces an instance of EventContext. Additional adjustments include supporting a business connection ID for event context identification and facilitating backwards compatibility. Tests and other files were also updated accordingly for these changes.

* Cover FSM key builder (business_connection_id

* Added changelog

---------

Co-authored-by: RoLOQ <roman.fedunn@gmail.com>

tests/test_api/test_methods/test_get_business_connection.py

@@ -0,0 +1,24 @@
+from aiogram.methods import GetBusinessConnection
+from aiogram.types import BusinessConnection, User
+from tests.mocked_bot import MockedBot
+
+
+class TestGetBusinessConnection:
+    async def test_bot_method(self, bot: MockedBot):
+        prepare_result = bot.add_result_for(
+            GetBusinessConnection,
+            ok=True,
+            result=BusinessConnection(
+                id="test",
+                user=User(id=42, is_bot=False, first_name="User"),
+                user_chat_id=42,
+                date=42,
+                can_reply=True,
+                is_enabled=True,
+            ),
+        )
+        response: BusinessConnection = await bot.get_business_connection(
+            business_connection_id="test"
+        )
+        request = bot.get_request()
+        assert response == prepare_result.result