[3.x] Bot API 6.0 (#890)

* Base implementation

* Bump license

* Revert re-generated tests

* Fix tests, improved docs

* Remove TODO

* Removed unreachable code

* Changed type of `last_synchronization_error_date`

* Fixed wrongly cleaned code

examples/web_app/main.py

@@ -0,0 +1,49 @@
+import logging
+from os import getenv
+
+from aiohttp.web import run_app
+from aiohttp.web_app import Application
+from handlers import my_router
+from routes import check_data_handler, demo_handler, send_message_handler
+
+from aiogram import Bot, Dispatcher
+from aiogram.dispatcher.webhook.aiohttp_server import SimpleRequestHandler, setup_application
+from aiogram.types import MenuButtonWebApp, WebAppInfo
+
+TELEGRAM_TOKEN = getenv("TELEGRAM_TOKEN")
+APP_BASE_URL = getenv("APP_BASE_URL")
+
+
+async def on_startup(bot: Bot, base_url: str):
+    await bot.set_webhook(f"{base_url}/webhook")
+    await bot.set_chat_menu_button(
+        menu_button=MenuButtonWebApp(text="Open Menu", web_app=WebAppInfo(url=f"{base_url}/demo"))
+    )
+
+
+def main():
+    bot = Bot(token=TELEGRAM_TOKEN, parse_mode="HTML")
+    dispatcher = Dispatcher()
+    dispatcher["base_url"] = APP_BASE_URL
+    dispatcher.startup.register(on_startup)
+
+    dispatcher.include_router(my_router)
+
+    app = Application()
+    app["bot"] = bot
+
+    app.router.add_get("/demo", demo_handler)
+    app.router.add_post("/demo/checkData", check_data_handler)
+    app.router.add_post("/demo/sendMessage", send_message_handler)
+    SimpleRequestHandler(
+        dispatcher=dispatcher,
+        bot=bot,
+    ).register(app, path="/webhook")
+    setup_application(app, dispatcher, bot=bot)
+
+    run_app(app, host="127.0.0.1", port=8081)
+
+
+if __name__ == "__main__":
+    logging.basicConfig(level=logging.INFO)
+    main()