Run a handler for all messages, then another only for commands

[IlyaBizyaev]

For a Telegram bot that manages chats, I need to be able to:

• handle any "common" messages to the chat to perform some moderation;
• if the message also happens to be a command, then run the corresponding command handler.

Not running chat_handler for command invocations is not an option because it enables malicious actors to hide bad messages under command prefixes.

Is it currently possible to achieve this with dptree? I thought of using filter_async, which would have an added benefit of not running command handlers at all if the message was deleted, but it appears that I would need something like try_filter_async (#26) for proper error handling (Telegram API, database). Also, it this existed, would Teloxide be able to pass errors from the fallible filter to Dispatcher's error_handler?

[IlyaBizyaev]

For context, I previously used python-telegram-bot's handler groups for this.