- Aggregated with time ranges. Example from unit tests:
> dune exec src/lib_base/unix/test/main.exe --
    --file test_simple_profiler.ml

    "report":
        { "aggregated":
            [ { "name": "a_aggr",
                "data":
                [ { "count": 1,
                    "agg_dur": { "wall": 0.0252829, "cpu": 0.000317 },
                    "start":
                        { "wall": "2024-03-21T10:27:57.113-00:00",
                        "cpu": 0.873036 },
                    "finish":
                        { "wall": "2024-03-21T10:27:57.138-00:00",
                        "cpu": 0.873355 } },
                    { "count": 1,
                    "agg_dur": { "wall": 0.0352101, "cpu": 0.000232 },
                    "start":
                        { "wall": "2024-03-21T10:27:57.078-00:00",
                        "cpu": 0.872799 },
                    "finish":
                        { "wall": "2024-03-21T10:27:57.113-00:00",
                        "cpu": 0.873032 } },
                    { "count": 1,
                    "agg_dur": { "wall": 0.0126569, "cpu": 0.000143 },
                    "start":
                        { "wall": "2024-03-21T10:27:57.053-00:00",
                        "cpu": 0.872537 },
                    "finish":
                        { "wall": "2024-03-21T10:27:57.065-00:00",
                        "cpu": 0.872681 } } ],

> dune exec src/lib_base/unix/test/main.exe -- --file test_simple_profiler.ml

TEST: test_merge_data_lists

slot_size=1000
                   1: ::{cnt=1 0.100 - 0.200 agg=0.000}
                   2: ::{cnt=1 0.100 - 0.200 agg=0.000}
            expected: ::{cnt=2 0.100 - 0.200 agg=0.000}
      test_identical: ::{cnt=2 0.100 - 0.200 agg=0.000}

slot_size=1000
                   1: ::{cnt=1 0.100 - 0.200 agg=0.000}
                   2: ::{cnt=1 0.100 - 0.300 agg=0.000}
            expected: ::{cnt=2 0.100 - 0.300 agg=0.000}
test_start_identical: ::{cnt=2 0.100 - 0.300 agg=0.000}
...