Creates a TelegramCommandHandler wired to the declarative route registry.
Options including mediator, notifier, optional features and logger.
Routes an incoming message or callback to the correct handler.
The raw message text or callback_data string.
Procedure indicating the command was handled.
Handles an incoming photo message.
Telegram file_id of the photo.
Optional_caption: string
Optional caption text (reserved for future use).
Procedure indicating the processing result.
Handles bot commands dispatched from TelegramPoller.