[REQUEST] Provide the completed Parameter for the track Function to Support Resumable Progress

[Haskely]

Issue Description:

I've noticed that when using the track function in rich.progress, there is no direct way to set the completed steps (completed), making it less convenient to implement resumable progress.

Expected Solution:

I would like to request the addition of a completed parameter in the track function. This enhancement would make it easier for users to implement resumable progress by allowing the saving and loading of completed work, enabling the ability to resume progress mid-task.

Example Usage:

from rich.progress import track

# Current usage
for item in track(items, description="Processing..."):
    # Some processing logic

# Expected usage
for item in track(items, description="Processing...", completed=saved_progress):
    # Some processing logic

[github-actions]

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