feat: add EosMixingRuleType enum type and test

[asmfstatoil]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 56.47059% with 37 lines in your changes missing coverage. Please review.

Project coverage is 41.12%. Comparing base (3034fdb) to head (5b58dd5).

Files with missing lines	Patch %	Lines
...c/main/java/neqsim/thermo/system/SystemThermo.java	45.45%	7 Missing and 5 partials ⚠️
...va/neqsim/thermo/mixingrule/EosMixingRuleType.java	46.66%	8 Missing ⚠️
src/main/java/neqsim/thermo/Fluid.java	25.00%	5 Missing and 1 partial ⚠️
.../java/neqsim/thermo/mixingrule/CPAMixingRules.java	57.14%	6 Missing ⚠️
...c/main/java/neqsim/thermo/component/Component.java	82.60%	2 Missing and 2 partials ⚠️
.../java/neqsim/thermo/mixingrule/EosMixingRules.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1237      +/-   ##
============================================
+ Coverage     41.06%   41.12%   +0.06%     
- Complexity     6003     6019      +16     
============================================
  Files           719      720       +1     
  Lines         68233    68252      +19     
  Branches       8158     8162       +4     
============================================
+ Hits          28018    28068      +50     
+ Misses        38534    38503      -31     
  Partials       1681     1681              

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[EvenSol]

good update!