`sky storage ls` should take bucket name as an arg, same as `status`

[concretevitamin]

User story:

• I was testing out https://github.com/skypilot-org/skypilot/blob/a04f327021191820fe21eea5329ce2224951d951/llm/vicuna-2/README.md#kick-start-the-training-on-any-cloud which asked the user to enter a bucket name, without specifying store (S3/GCS/R2)
• After the task starts running, I want to look at the bucket -- but I am not 100% sure which object store it's created on
• So I want to use sky storage ls to check its location. However, this prints a ton of buckets, and I had to sky storage ls | grep ... to find it.
• It'd be better to sky storage ls my-bucket. Same as sky status my-cluster.

cc @landscapepainter

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NOTE: sky storage ls my-bucket now sounds like it's a cloud-agnostic ls (list bucket contents). Maybe ok for now but worth keeping in mind. Perhaps we should rename to sky storage status.

[landscapepainter]

@concretevitamin Thanks for sharing the issue! I agree that sky storage ls my-bucket sounds like it would be listing bucket contents. We can implement sky storage ls my-bucket to actually list the contents if there's any request. As gsutil ls does list out the list of buckets like how sky storage ls does, I believe sky storage my-bucket without ls also can be a viable option for users to specify the buckets.

[aseriesof-tubes]

Hi, I'd like to work on this issue!

[github-actions[bot]]

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