fix(config): substitute timestamp in storage paths

[yangligt2]

fixes #329

Updated inference_perf/config.py to detect and replace {timestamp} with the current time (format: %Y%m%d-%H%M%S) in storage paths for local_storage, google_cloud_storage, and simple_storage_service.

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[Bslabe123]

/lgtm

[jjk-g]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jjk-g, yangligt2

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