feat: Add immiscible water flash model

[dkachuma]

Implementation of an immiscible water flash model. This is a compositional model in which the water component is separated into its own (third) phase and doesn't take part in the negative two phase flash. This is similar in implementation to the BlackOilFluid.

[codecov]

Codecov Report

Attention: Patch coverage is 94.24779% with 13 lines in your changes missing coverage. Please review.

Project coverage is 56.56%. Comparing base (42966e9) to head (5094fc9).
Report is 89 commits behind head on develop.

Files with missing lines	Patch %	Lines
...compositional/models/ImmiscibleWaterParameters.cpp	59.09%	9 Missing ⚠️
...compositional/models/ImmiscibleWaterFlashModel.cpp	93.33%	2 Missing ⚠️
...compositional/models/ImmiscibleWaterFlashModel.hpp	94.87%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3237      +/-   ##
===========================================
+ Coverage    56.46%   56.56%   +0.10%     
===========================================
  Files         1059     1064       +5     
  Lines        89458    89682     +224     
===========================================
+ Hits         50512    50730     +218     
- Misses       38946    38952       +6     

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