Add argparse benchmarks for subparsers and many optionals
#1700
| Job | Run time |
|---|---|
| 6m 10s | |
| 6m 13s | |
| 7m 16s | |
| 7m 53s | |
| 7m 51s | |
| 8m 34s | |
| 7m 52s | |
| 8m 38s | |
| 10m 0s | |
| 9m 34s | |
| 4m 55s | |
| 12m 23s | |
| 1h 37m 19s |