Move aliases for minpoly and charpoly from Oscar

[lgoettgens]

Since Oscar is not adapted to 0.41 yet, we can move this now easily without getting precompilation errors.

x-ref: https://github.com/oscar-system/Oscar.jl/blob/bfd7624b3f2ed4c057770440756fe9066ad297e5/src/aliases.jl#L4-L5

[codecov[bot]]

Codecov Report

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

Project coverage is 86.85%. Comparing base (8ac3e1f) to head (6d5c3d8).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1696 +/- ## ========================================== - Coverage 87.28% 86.85% -0.43% ========================================== Files 116 116 Lines 29736 29710 -26 ========================================== - Hits 25954 25805 -149 - Misses 3782 3905 +123 ```

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