feat: add constructorof for DiscreteProblem
#3373
| Job | Run time |
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| 19m 41s | |
| 31m 21s | |
| 13m 41s | |
| 7m 46s | |
| 33m 57s | |
| 21m 32s | |
| 22m 10s | |
| 21m 50s | |
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| 56m 51s | |
| 17m 32s | |
| 33m 1s | |
| 33m 24s | |
| 27m 4s | |
| 25m 35s | |
| 21m 14s | |
| 11m 43s | |
| 6m 13s | |
| 31m 10s | |
| 25m 51s | |
| 9m 15s | |
| 29m 53s | |
| 51m 0s | |
| 34m 38s | |
| 22m 18s | |
| 5m 44s | |
| 8m 5s | |
| 49m 18s | |
| 44m 13s | |
| 40m 59s | |
| 39m 37s | |
| 33m 53s | |
| 1h 1m 25s | |
| 15h 18m 50s |