Remove syms and paramsyms arguments for OptimizationFuntion

[sunxd3]

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 SciML Style Guide and
  COLPRAC.
• Any new documentation only uses public API

Additional context

In this PR, syms and paramsyms fields are removed from OptimizationFunction.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8d53748) 0.11% compared to head (b160d13) 7.74%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #644      +/-   ##
=========================================
+ Coverage    0.11%   7.74%   +7.63%     
=========================================
  Files          40      40              
  Lines        2689    2699      +10     
=========================================
+ Hits            3     209     +206     
+ Misses       2686    2490     -196     

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[ChrisRackauckas]

Handled in #626