add vega thermo classes and test

[EvenSol]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 70.83333% with 28 lines in your changes missing coverage. Please review.

Project coverage is 42.19%. Comparing base (2d68c3d) to head (5451466).

Files with missing lines	Patch %	Lines
.../main/java/neqsim/thermo/system/SystemVegaEos.java	55.88%	13 Missing and 2 partials ⚠️
...rc/main/java/neqsim/thermo/phase/PhaseVegaEos.java	82.22%	7 Missing and 1 partial ⚠️
...java/neqsim/thermo/component/ComponentVegaEos.java	70.58%	5 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1302      +/-   ##
============================================
+ Coverage     42.14%   42.19%   +0.04%     
- Complexity     6326     6353      +27     
============================================
  Files           738      741       +3     
  Lines         70284    70380      +96     
  Branches       8449     8455       +6     
============================================
+ Hits          29624    29697      +73     
- Misses        38798    38819      +21     
- Partials       1862     1864       +2     

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