Pass the current query object to the callback

[renatonascalves]

Description

The current query object is passed to the callback run into a batch.

https://github.com/alleyinteractive/wp-bulk-task/blob/6fc381cab4c0494b7695e97725a465d9007b7a13/src/class-bulk-task.php#L537

Use Case

A script might need access to the current query object to perform changes that might be needed inside the callback.

For example, a callback might have functions that require/depend on the query object to be present.

For Alley devs, see this thread.

Acceptance Criteria

• Pass the query as a third parameter (the second arg is always the array key) to the callback so it's available for implementers who want to use it.
• Confirm that doing so doesn't break callback functions that only have one parameter.