feat: add support for getu/setu in SII, add tests

[AayushSabharwal]

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.

[AayushSabharwal]

Tests won't run until SII is tagged

[AayushSabharwal]

This requires SciML/RecursiveArrayTools.jl#322

[codecov]

Codecov Report

Attention: 16 lines in your changes are missing coverage. Please review.

Comparison is base (cd04572) 39.45% compared to head (ed57e16) 30.37%.
Report is 5 commits behind head on master.

Files	Patch %	Lines
src/integrator_interface.jl	0.00%	9 Missing ⚠️
src/problems/problem_interface.jl	0.00%	6 Missing ⚠️
src/solutions/solution_interface.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #582      +/-   ##
==========================================
- Coverage   39.45%   30.37%   -9.08%     
==========================================
  Files          53       53              
  Lines        4038     4039       +1     
==========================================
- Hits         1593     1227     -366     
- Misses       2445     2812     +367     

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[ChrisRackauckas]

This requires SciML/RecursiveArrayTools.jl#322

Bump the version requirement