Fix ImperativeAffect namespacing for arrays in non-root components

[BenChung]

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

ImperativeAffect's renamespace doesn't properly handle ParentScope array arguments, instead munging them into a single symbol containing the string-ed array. This change explicitly handles this case of renamespacing.

[ChrisRackauckas]

Needs tests

[ChrisRackauckas]

Is the FMI failure related? Idon't think that was on master.

[BenChung]

@ChrisRackauckas Looks like it, huh. My suspicion is that the FMI compilation is running into the array variable scoping problems that I'm poking at with this. I'll talk to Aayush and see if there's a better way to fix this