946 implement generalized linear chain trick

[lenaploetzke]

Changes and Information

Please briefly list the changes (main added features, changed items, or corrected bugs) made:

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If need be, add additional information and what the reviewer should look out for in particular:

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Merge Request - Guideline Checklist

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Checks by code author

• [ ] Every addressed issue is linked (use the "Closes #ISSUE" keyword below)
• [ ] New code adheres to coding guidelines
• [ ] No large data files have been added (files should in sum not exceed 100 KB, avoid PDFs, Word docs, etc.)
• [ ] Tests are added for new functionality and a local test run was successful (with and without OpenMP)
• [ ] Appropriate documentation for new functionality has been added (Doxygen in the code and Markdown files if necessary)
• [ ] Proper attention to licenses, especially no new third-party software with conflicting license has been added
• [ ] (For ABM development) Checked benchmark results and ran and posted a local test above from before and after development to ensure performance is monitored.

Checks by code reviewer(s)

• [ ] Corresponding issue(s) is/are linked and addressed
• [ ] Code is clean of development artifacts (no deactivated or commented code lines, no debugging printouts, etc.)
• [ ] Appropriate unit tests have been added, CI passes, code coverage and performance is acceptable (did not decrease)
• [ ] No large data files added in the whole history of commits(files should in sum not exceed 100 KB, avoid PDFs, Word docs, etc.)
• [ ] On merge, add 2-5 lines with the changes (main added features, changed items, or corrected bugs) to the merge-commit-message. This can be taken from the briefly-list-the-changes above (best case) or the separate commit messages (worst case).

Closes #946.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 96.21212% with 15 lines in your changes missing coverage. Please review.

Project coverage is 96.22%. Comparing base (d439941) to head (6c06904).

Files	Patch %	Lines
cpp/models/glct_secir/parameters.h	93.48%	14 Missing :warning:
cpp/memilio/epidemiology/populations.h	66.66%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1058 +/- ## ========================================== - Coverage 96.24% 96.22% -0.02% ========================================== Files 127 129 +2 Lines 10886 11238 +352 ========================================== + Hits 10477 10814 +337 - Misses 409 424 +15 ```

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