Add argparse benchmarks for subparsers and many optionals
#1699
| Job | Run time |
|---|---|
| 6m 5s | |
| 6m 21s | |
| 7m 19s | |
| 7m 46s | |
| 8m 14s | |
| 8m 44s | |
| 7m 35s | |
| 8m 40s | |
| 10m 3s | |
| 9m 30s | |
| 5m 11s | |
| 11m 40s | |
| 1h 37m 8s |