Add argparse benchmarks for subparsers and many optionals
#1698
| Job | Run time |
|---|---|
| 5m 59s | |
| 6m 11s | |
| 7m 18s | |
| 7m 54s | |
| 7m 58s | |
| 8m 28s | |
| 7m 16s | |
| 9m 0s | |
| 10m 9s | |
| 9m 28s | |
| 5m 9s | |
| 13m 53s | |
| 1h 38m 43s |