REP-6000 Add a “Detail” column to the worker-thread table.

[FGasper]

This will make it easier to confirm, at a glance, that a given worker thread is still doing useful work.

Sample output:

Active worker threads (24 of 30):
+----------+---------------------+--------------------------+--------------+--------------------------+
| THREAD # |      NAMESPACE      |           TASK           | TIME ELAPSED |          DETAIL          |
+----------+---------------------+--------------------------+--------------+--------------------------+
|        0 | mmsdbjobs.data.jobs | 680a8636d968b0b72db5ae6f | 2m 12.05s    | read 228,176 documents   |
|        1 | mmsdbjobs.data.jobs | 680a8621d968b0b72db5ae20 | 19m 16.15s   | read 184,025 documents   |
|        2 | mmsdbjobs.data.jobs | 680a8626d968b0b72db5ae59 | 9m 23.05s    | read 319,682 documents   |
|        3 | mmsdbjobs.data.jobs | 680a8626d968b0b72db5ae5b | 8m 32.19s    | read 119,675 documents   |
|        4 | mmsdbjobs.data.jobs | 680a8626d968b0b72db5ae5c | 8m 19.98s    | read 772,206 documents   |
|        5 | mmsdbjobs.data.jobs | 680a8621d968b0b72db5ae22 | 19m 16.11s   | read 360,654 documents   |
|        7 | mmsdbjobs.data.jobs | 680a8621d968b0b72db5ae21 | 19m 16.11s   | read 655,567 documents   |
|        8 | mmsdbjobs.data.jobs | 680a8621d968b0b72db5ae2d | 19m 15.02s   | read 412,040 documents   |
|        9 | mmsdbjobs.data.jobs | 680a8634d968b0b72db5ae69 | 4m 16.92s    | read 356,065 documents   |
|       11 | mmsdbjobs.data.jobs | 680a8621d968b0b72db5ae2e | 19m 15s      | read 652,112 documents   |
|       12 | mmsdbjobs.data.jobs | 680a8631d968b0b72db5ae68 | 4m 30.78s    | read 190,391 documents   |
|       13 | mmsdbjobs.data.jobs | 680a8628d968b0b72db5ae62 | 5m 15.16s    | read 341,443 documents   |
|       14 | mmsdbjobs.data.jobs | 680a8621d968b0b72db5ae32 | 19m 14.96s   | read 1,275,880 documents |
|       15 | mmsdbjobs.data.jobs | 680a8621d968b0b72db5ae30 | 19m 14.96s   | read 416,037 documents   |
|       16 | mmsdbjobs.data.jobs | 680a8636d968b0b72db5ae6e | 2m 30.34s    | read 237,879 documents   |
|       18 | mmsdbjobs.data.jobs | 680a8622d968b0b72db5ae40 | 16m 46.99s   | read 534,701 documents   |
|       19 | mmsdbjobs.data.jobs | 680a8636d968b0b72db5ae70 | 2m 5.68s     | read 237,377 documents   |
|       21 | mmsdbjobs.data.jobs | 680a8634d968b0b72db5ae6b | 3m 32.16s    | read 354,357 documents   |
|       22 | mmsdbjobs.data.jobs | 680a8635d968b0b72db5ae6d | 3m 18.42s    | read 216,583 documents   |
|       24 | mmsdbjobs.data.jobs | 680a8624d968b0b72db5ae53 | 10m 7.77s    | read 645,053 documents   |
|       25 | mmsdbjobs.data.jobs | 680a8627d968b0b72db5ae5f | 7m 37.17s    | read 174,812 documents   |
|       26 | mmsdbjobs.data.jobs | 680a8627d968b0b72db5ae61 | 6m 31.1s     | read 55,576 documents    |
|       27 | mmsdbjobs.data.jobs | 680a8624d968b0b72db5ae50 | 11m 20.83s   | read 386,301 documents   |
|       29 | mmsdbjobs.data.jobs | 680a8625d968b0b72db5ae57 | 9m 26.7s     | read 181,016 documents   |
+----------+---------------------+--------------------------+--------------+--------------------------+