Added full support for Bot API 8.0 (#1606)

* Added full support of Bot API 8.0

* Added tests

* Reformat code

* Added changelog

* Bump API version

docs/api/methods/save_prepared_inline_message.rst

@@ -0,0 +1,45 @@
+#########################
+savePreparedInlineMessage
+#########################
+
+Returns: :obj:`PreparedInlineMessage`
+
+.. automodule:: aiogram.methods.save_prepared_inline_message
+    :members:
+    :member-order: bysource
+    :undoc-members: True
+    :exclude-members: model_config,model_fields
+
+
+Usage
+=====
+
+As bot method
+-------------
+
+.. code-block::
+
+    result: PreparedInlineMessage = await bot.save_prepared_inline_message(...)
+
+
+Method as object
+----------------
+
+Imports:
+
+- :code:`from aiogram.methods.save_prepared_inline_message import SavePreparedInlineMessage`
+- alias: :code:`from aiogram.methods import SavePreparedInlineMessage`
+
+With specific bot
+~~~~~~~~~~~~~~~~~
+
+.. code-block:: python
+
+    result: PreparedInlineMessage = await bot(SavePreparedInlineMessage(...))
+
+As reply into Webhook in handler
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. code-block:: python
+
+    return SavePreparedInlineMessage(...)