fix: remove usages of syms/paramsyms/indepsym keyword argument

[AayushSabharwal]

Close #618

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

Add any other context about the problem here.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (0475fc3) 38.81% compared to head (8898aa2) 38.77%.

Files	Patch %	Lines
src/scimlfunctions.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #624      +/-   ##
==========================================
- Coverage   38.81%   38.77%   -0.05%     
==========================================
  Files          55       55              
  Lines        4261     4261              
==========================================
- Hits         1654     1652       -2     
- Misses       2607     2609       +2     

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[oscardssmith]

isn't there still a lot of code that uses these fields if the sys is unavailable?

[ChrisRackauckas]

Is there? I don't know of any at least. It should've been throwing warnings for at least a few months now?