feat: cape cin

[VeraChristina]

Description

Add basic functionality for CAPE/CIN

TODO:

• docs
• finalize public numpy API, incl output options
• more comprehensive tests
• adapt tests to design in thermo

Contributor Declaration

By opening this pull request, I affirm the following:

• All authors agree to the Contributor License Agreement.
• The code follows the project's coding standards.
• I have performed self-review and added comments where needed.
• I have added or updated tests to verify that my changes are effective and functional.
• I have run all existing tests and confirmed they pass.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.27%. Comparing base (688d7f2) to head (1495dd7).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #126      +/-   ##
===========================================
+ Coverage    99.24%   99.27%   +0.03%     
===========================================
  Files           27       28       +1     
  Lines         2384     2495     +111     
  Branches        44       50       +6     
===========================================
+ Hits          2366     2477     +111     
  Misses           9        9              
  Partials         9        9              

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