Flash improvements + flash bypass infrastructure

[moyner]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 58.06452% with 39 lines in your changes are missing coverage. Please review.

Project coverage is 67.82%. Comparing base (ad10e6e) to head (ac89e7b).
Report is 5 commits behind head on main.

Files	Patch %	Lines
src/flash_types.jl	21.05%	15 Missing ⚠️
src/flow_coupler_types.jl	0.00%	10 Missing ⚠️
src/flash.jl	76.00%	6 Missing ⚠️
src/eos.jl	54.54%	5 Missing ⚠️
src/stability.jl	83.33%	3 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #20      +/-   ##
==========================================
+ Coverage   67.59%   67.82%   +0.22%     
==========================================
  Files          16       16              
  Lines        1148     1237      +89     
==========================================
+ Hits          776      839      +63     
- Misses        372      398      +26     

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