Add `-less-stats` cmd param to group targets by protocols

[roman-kruglov]

Description

Adds a cmd line parameter -less-stats to group all target stats by protocols. Currently the list of stats could be very long and it's not always convenient to observe.

Maybe "fewer" would be more grammatical, but I guess "less" is kinda more conventional for text and more widespread (think of less utility).

Type of change

• [x] New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Running in a terminal and observing the output.

Test Configuration

• Release version: latest main (latest release is 0.9.8)
• Platform: Mac OS

Logs

After the change with -less-stats supplied:

 --- Traffic stats ---
 | Target | Requests attempted | Requests sent | Responses received | Data sent |
 |   http |               8707 |          2491 |               2491 |   0.41 MB |
 |  https |               8225 |          1051 |               1051 |   0.17 MB |
 |    tcp |              37952 |         37944 |                  0 |   0.36 MB |
 |    --- |                --- |           --- |                --- |       --- |
 |  Total |              54884 |         41486 |               3542 |   0.94 MB |