[WIP] Keep symbolic expressions from mtk, make it moi compatible later

[Vaibhavdixit02]

Checklist

• [] Appropriate tests were added
• [] Any code changes were done in a way that does not break public API
• [] All documentation related to code changes were updated
• [] The new code follows the
  contributor guidelines, in particular the ScioML Style Guide and
  COLPRAC.
• [] Any new documentation only uses public API

Additional context

Add any other context about the problem here.

[codecov]

Codecov Report

Attention: 89 lines in your changes are missing coverage. Please review.

Comparison is base (6fc5804) 0.00% compared to head (75d197b) 7.47%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
lib/OptimizationMOI/src/OptimizationMOI.jl	0.00%	49 Missing ⚠️
lib/OptimizationMOI/src/nlp.jl	0.00%	28 Missing ⚠️
lib/OptimizationMOI/src/moi.jl	0.00%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #636      +/-   ##
=========================================
+ Coverage    0.00%   7.47%   +7.47%     
=========================================
  Files          12      40      +28     
  Lines        1141    2730    +1589     
=========================================
+ Hits            0     204     +204     
- Misses       1141    2526    +1385     

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