Add GPU metrics parsing to stream density scripts

[sainijit]

• Add parser_script and parser_args arguments to both stream density scripts
• Call parse_qmassa_metrics_to_json.py after benchmark run to collect GPU metrics
• Matches behavior of benchmark_order_accuracy.py

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• Commit Message meets guidelines as indicated in the URL https://github.com/intel-retail/performance-tools/blob/main/CONTRIBUTING.md
• Every commit is a single defect fix and does not mix feature addition or changes
• Unit Tests have been added for new changes
• Updated Documentation as relevant to the changes
• All commented code has been removed
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• PR change contains code related to security
• PR introduces changes that breaks compatibility with other modules (If YES, please provide details below)

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