Extended and revised problem library

[SKopecz]

• Added prob_pds_minmapk to problem library
• Added std_rhs to library problems
• Added tests

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.24%. Comparing base (92b7e71) to head (7ef0b71).

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #118 +/- ## ========================================== + Coverage 98.14% 98.24% +0.09% ========================================== Files 7 7 Lines 1458 1537 +79 ========================================== + Hits 1431 1510 +79 Misses 27 27 ```

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