896 add age resolved lct model

[lenaploetzke]

Changes and Information

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

• Added the possibility to use groups (e.g. age groups) in the LCT-SECIR model. The parameters and the number of subcompartments can be set differently for each group.
• Adapted functionality to initialize the model.
• Added tests.

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

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Closes #896

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.58%. Comparing base (896a04e) to head (26b509a).
Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1120      +/-   ##
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+ Coverage   96.44%   96.58%   +0.13%     
==========================================
  Files         135      137       +2     
  Lines       11286    11030     -256     
==========================================
- Hits        10885    10653     -232     
+ Misses        401      377      -24     

Flag	Coverage Δ
	96.58% <100.00%> (?)

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[annawendler]

Looks very good!

What I found hard to understand at first was that LctStates contains the number of subcompartments and not the subcompartments themselves. Maybe this could be made clearer by renaming it to NumLctStates or a more detailed explanation in the Populations class (or both).

[reneSchm]

Nice work with the compile time recursion. I have several nitpicks comments on general design, I hope this is as intended.

[reneSchm]

Very nice changes. I only have some small issues with the details around is_age_resolved_entry_type.

[reneSchm]

I just noticed that I could have answered the question whether a specific EntryType was expected myself, it says so in the doc string.
Anyways, the changes look good.