Hackeython smt mod

[BookWood7th]

Intended Change

SMT-Translation translates mod as an uninterpreted symbol. As div is translated as is, and SMT has an axiom stating a = a div b * b + a mod b. mod in SMT will be the same as in KeY.

Type of pull request

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] Refactoring (behaviour should not change or only minimally change)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] There are changes to the (Java) code
• [ ] There are changes to the taclet rule base
• [ ] There are changes to the deployment/CI infrastructure (gradle, github, ...)
• [ ] Other:

Ensuring quality

• [x] I made sure that introduced/changed code is well documented (javadoc and inline comments).
• [ ] I made sure that new/changed end-user features are well documented (https://github.com/KeYProject/key-docs).
• [x] I added new test case(s) for new functionality.
• [x] I have tested the feature as follows: 5/2 -5/2 5/-2 -5/-2 and checking that mod is nonnegative and x mod y < |y|
• [ ] I have checked that runtime performance has not deteriorated.

Additional information and contact(s)

The contributions within this pull request are licensed under GPLv2 (only) for inclusion in KeY.

[codecov[bot]]

Codecov Report

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

Project coverage is 37.77%. Comparing base (1fb0c10) to head (d15f5d3). Report is 13 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3418 +/- ## ============================================ - Coverage 37.77% 37.77% -0.01% Complexity 17031 17031 ============================================ Files 2076 2076 Lines 126950 126951 +1 Branches 21381 21381 ============================================ Hits 47952 47952 Misses 73092 73092 - Partials 5906 5907 +1 ```

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