feat: broker can be passed to WorkerArgs

[danfimov]

Context

Currently, it’s not possible to pass a broker instance directly to WorkerArgs when running a worker programmatically via run_worker(WorkerArgs(...)). For example, in the following scenario, the broker is stored as a class field, which prevents using a string path (as required by the CLI): https://yaso.su/hugecock

This patch adds support for passing a broker instance directly as a parameter instead of using its string path.

[Copilot]

Pull Request Overview

This PR adds support for passing an AsyncBroker instance directly to WorkerArgs, enabling programmatic worker execution without requiring a string import path. This is useful when the broker is stored as a class field rather than at module level.

Key changes:

• Modified the broker field type in WorkerArgs from str to Union[str, AsyncBroker]
• Added runtime type checking in start_listen() to handle both string paths and broker instances

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
taskiq/cli/worker/args.py	Updated type annotation for broker field to accept both string and AsyncBroker instances
taskiq/cli/worker/run.py	Added conditional logic to check if broker is already an AsyncBroker instance before attempting to import it

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