Pretty print outputs on console

[chatman]

Upon a successful execution, results are written to a JSON file and also printed as follows:

2023-06-20 13:48:12 INFO  StressMain:221 - Final results: {task1=[{end-time=475.336, init-timestamp=1687248402433, 
end-timestamp=1687248877769, start-timestamp=1687248402496, start-time=0.063, total-time=472.711832794}], 
task2=[{total-time=9.968, start-time=475.343, node-shutdown=3.193, end-time=485.311, end-
timestamp=1687248887744, heap-mb=-1.0, node-startup=6.604, init-timestamp=1687248402433, start-
timestamp=1687248877776}, {total-time=20.342, start-time=485.313, node-shutdown=13.55, end-time=505.655, end-
timestamp=1687248908088, heap-mb=-1.0, node-startup=6.639, init-timestamp=1687248402433, start-
timestamp=1687248887746}, {total-time=10.065, start-time=505.658, node-shutdown=3.258, end-time=515.723, end-
timestamp=1687248918156, heap-mb=-1.0, node-startup=6.648, init-timestamp=1687248402433, start-
timestamp=1687248908091}], task3=[{timings=[{threads=1, 50th=3.1585055000000004, 90th=69.55851529999995, 
95th=210.11235779999993, mean=33.322745040562246, total-queries=4980, total-time=173908}], start-time=515.741, 
total-time=173944, start-timestamp=1687248918174, init-timestamp=1687248402433, end-time=689.685, end-
timestamp=1687249092118}]}

In OpenSearch-Benchmarks, the output is a pretty print like this:

        _______             __   _____
       / ____(_)___  ____ _/ /  / ___/_________  ________
      / /_  / / __ \/ __ `/ /   \__ \/ ___/ __ \/ ___/ _ \
     / __/ / / / / / /_/ / /   ___/ / /__/ /_/ / /  /  __/
    /_/   /_/_/ /_/\__,_/_/   /____/\___/\____/_/   \___/
    ------------------------------------------------------

    |                         Metric |                 Task |     Value |   Unit |
    |-------------------------------:|---------------------:|----------:|-------:|
    |            Total indexing time |                      |   28.0997 |    min |
    |               Total merge time |                      |   6.84378 |    min |
    |             Total refresh time |                      |   3.06045 |    min |
    |               Total flush time |                      |  0.106517 |    min |
    |      Total merge throttle time |                      |   1.28193 |    min |
    |               Median CPU usage |                      |     471.6 |      % |
    |             Total Young Gen GC |                      |    16.237 |      s |
    |               Total Old Gen GC |                      |     1.796 |      s |
    |                     Index size |                      |   2.60124 |     GB |
    |                  Total written |                      |   11.8144 |     GB |
    |         Heap used for segments |                      |   14.7326 |     MB |
    |       Heap used for doc values |                      |  0.115917 |     MB |
    |            Heap used for terms |                      |   13.3203 |     MB |
    |            Heap used for norms |                      | 0.0734253 |     MB |
    |           Heap used for points |                      |    0.5793 |     MB |
    |    Heap used for stored fields |                      |  0.643608 |     MB |
    |                  Segment count |                      |        97 |        |
    |                 Min Throughput |         index-append |   31925.2 | docs/s |
    |              Median Throughput |         index-append |   39137.5 | docs/s |
    |                 Max Throughput |         index-append |   39633.6 | docs/s |
    |      50.0th percentile latency |         index-append |   872.513 |     ms |
    |      90.0th percentile latency |         index-append |   1457.13 |     ms |
    |      99.0th percentile latency |         index-append |   1874.89 |     ms |
    |       100th percentile latency |         index-append |   2711.71 |     ms |
    | 50.0th percentile service time |         index-append |   872.513 |     ms |
    | 90.0th percentile service time |         index-append |   1457.13 |     ms |
    | 99.0th percentile service time |         index-append |   1874.89 |     ms |
    |  100th percentile service time |         index-append |   2711.71 |     ms |
    |                           ...  |                  ... |       ... |    ... |
    |                           ...  |                  ... |       ... |    ... |
    |                 Min Throughput |     painless_dynamic |   2.53292 |  ops/s |
    |              Median Throughput |     painless_dynamic |   2.53813 |  ops/s |
    |                 Max Throughput |     painless_dynamic |   2.54401 |  ops/s |
    |      50.0th percentile latency |     painless_dynamic |    172208 |     ms |
    |      90.0th percentile latency |     painless_dynamic |    310401 |     ms |
    |      99.0th percentile latency |     painless_dynamic |    341341 |     ms |
    |      99.9th percentile latency |     painless_dynamic |    344404 |     ms |
    |       100th percentile latency |     painless_dynamic |    344754 |     ms |
    | 50.0th percentile service time |     painless_dynamic |    393.02 |     ms |
    | 90.0th percentile service time |     painless_dynamic |   407.579 |     ms |
    | 99.0th percentile service time |     painless_dynamic |   430.806 |     ms |
    | 99.9th percentile service time |     painless_dynamic |   457.352 |     ms |
    |  100th percentile service time |     painless_dynamic |   459.474 |     ms |

We can easily adopt this tabular printing for better user experience.