multi process model with test

[EvenSol]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 30.23256% with 30 lines in your changes missing coverage. Please review.

Project coverage is 40.80%. Comparing base (93be1b3) to head (e5e93ae).

Files with missing lines	Patch %	Lines
...java/neqsim/process/processmodel/ProcessModel.java	35.13%	20 Missing and 4 partials ⚠️
...ava/neqsim/process/processmodel/ProcessSystem.java	0.00%	6 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1212      +/-   ##
============================================
- Coverage     40.80%   40.80%   -0.01%     
- Complexity     5913     5919       +6     
============================================
  Files           717      718       +1     
  Lines         67901    67944      +43     
  Branches       8113     8116       +3     
============================================
+ Hits          27710    27725      +15     
- Misses        38526    38550      +24     
- Partials       1665     1669       +4     

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