Inject aiogram handlers once

[Olegt0rr]

The current implementation of setup_dishka (with autoinject enabled) uses AutoInjectMiddleware which does an inject at application runtime each time a handler is called. Which does unnecessary work and slows down the execution of the original handler.

I refined setup_dishka so that inject is done for each handler only once, at application startup.

For users who use AutoInjectMiddleware directly, I added a warning with a recommendation to switch to a more productive way of working.