Add DSE function

[tapios]

Adds a function to compute dry static energy (needed for surface fluxes). (Will add tests later when refactoring Thermodynamics.jl)

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.70%. Comparing base (9577fb1) to head (33b2e8e).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/air_energies.jl	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #287      +/-   ##
==========================================
- Coverage   90.87%   90.70%   -0.18%     
==========================================
  Files          21       21              
  Lines        1063     1065       +2     
==========================================
  Hits          966      966              
- Misses         97       99       +2     

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