Add detailed JSON support to performance summarization script

[aemous]

Description of changes:

• Added a new detailed_json output format to the performance summarization script. It outputs measurements from all iterations of the command instead of just the average / maxima.
• Added extra metadata that gets output with each metric which is useful for downstream processing of the metrics.
• Changed Summarizer class so that it returns the raw output data in summarize_as_json and summarize_as_detailed_json functions. Useful for external classes to utilize this data for processing.

Description of tests:

• Ran the following commands to benchmark a file upload with aws s3 cp and summarize the results in the new detailed JSON format:

% ./benchmark "aws s3 cp ~/file.dmg s3://test-bucket-aem278/file.dmg" --data-interval 0.1 --output-file perf1.csv
% ./benchmark "aws s3 cp ~/file.dmg s3://test-bucket-aem278/file.dmg" --data-interval 0.1 --output-file perf2.csv
% ./benchmark "aws s3 cp ~/file.dmg s3://test-bucket-aem278/file.dmg" --data-interval 0.1 --output-file perf3.csv
% python3 ./summarize.py perf1.csv perf2.csv perf3.csv --output-format detailed_json --benchmark-name s3.cp-upload

Output:

[
  {
    "name": "s3.cp-upload.total_time",
    "description": "The total execution time of the command.",
    "unit": "Milliseconds",
    "date": 1735074973.303767,
    "measurements": [
      354898.06270599365,
      355706.1140537262,
      348326.67684555054
    ]
  },
  {
    "name": "s3.cp-upload.max_memory",
    "description": "The maximum memory utilization of the CLI throughout execution of the command.",
    "unit": "Megabytes",
    "date": 1735074973.303767,
    "measurements": [
      123.338752,
      134.463488,
      130.023424
    ]
  },
  {
    "name": "s3.cp-upload.average_memory",
    "description": "The average memory utilization of the CLI throughout execution of the command.",
    "unit": "Megabytes",
    "date": 1735074973.303767,
    "measurements": [
      122.78925544327932,
      117.97557115870967,
      128.00244748641975
    ]
  },
  {
    "name": "s3.cp-upload.max_cpu_utilization",
    "description": "The maximum CPU utilization of the CLI throughout execution of the command.",
    "unit": "Percentage",
    "date": 1735074973.303767,
    "measurements": [
      3.1,
      3.0,
      4.2
    ]
  },
  {
    "name": "s3.cp-upload.average_cpu_utilization",
    "description": "The average CPU utilization of the CLI throughout execution of the command.",
    "unit": "Percentage",
    "date": 1735074973.303767,
    "measurements": [
      0.008484270734032429,
      0.026161290322580504,
      0.07978835978835712
    ]
  }
]

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