Add distillation solver metrics and feed tests

[EvenSol]

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 74.13793% with 90 lines in your changes missing coverage. Please review.
✅ Project coverage is 47.44%. Comparing base (4e32fcb) to head (40dd747).
⚠️ Report is 655 commits behind head on master.

Files with missing lines	Patch %	Lines
...ava/neqsim/process/equipment/EquipmentFactory.java	35.71%	20 Missing and 7 partials ⚠️
...im/process/processmodel/DexpiRoundTripProfile.java	52.00%	12 Missing and 12 partials ⚠️
...ess/equipment/distillation/DistillationColumn.java	85.18%	16 Missing and 4 partials ⚠️
...va/neqsim/process/processmodel/DexpiXmlReader.java	86.20%	8 Missing ⚠️
...ava/neqsim/process/processmodel/DexpiMetadata.java	0.00%	6 Missing ⚠️
...va/neqsim/process/processmodel/DexpiXmlWriter.java	91.48%	3 Missing and 1 partial ⚠️
...ava/neqsim/process/processmodel/ProcessSystem.java	87.50%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1615      +/-   ##
============================================
+ Coverage     47.35%   47.44%   +0.09%     
- Complexity     9114     9157      +43     
============================================
  Files           879      881       +2     
  Lines         86204    86433     +229     
  Branches      10875    10893      +18     
============================================
+ Hits          40818    41007     +189     
- Misses        42311    42337      +26     
- Partials       3075     3089      +14     

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