fix: fix n-dimensional view into n-dimensional SArray with Any eltype

[AayushSabharwal]

As of the latest release, trying to view into an SArray with an eltype of Any such that the view also returns an SArray would wrap the returned array in a scalar. _maybewrapscalar assumes that if the eltype of the array matches the type of the view, it must be a scalar view. This assumption breaks down when the eltype is Any. MWE:

julia> A = SVector{4, Any}(1,2,3,4)

julia> I = SVector{2}(3, 1)

julia> view(A, I)
Scalar{Any}((Any[3, 1],))

julia> view(A, [3, 1])
2-element view(::SVector{4, Any}, [3, 1]) with eltype Any:
 3
 1

I've verified that all the added tests fail on the latest release and pass with this PR.

[AayushSabharwal]

I'm not sure what to make of the CI failure or how it relates to the changes in this PR.

[mateuszbaran]

This looks reasonable.

Regarding the failure, IIRC Julia 1.6 doesn't support the new [1;;;] syntax but you can use something like @SArray fill(1, 1, 1) instead in the test.

[AayushSabharwal]

Makes sense, thanks. Pushed the fix.

[mateuszbaran]

Suggested change

	v = @inferred view(A, @SArray(fill(1, 1)))
	v = @inferred view(A, @SArray(fill(1, 1, 1)))

I think this needs one more 1: two for dimensions and one for for actual element? (similarly in the next test)

[AayushSabharwal]

Looks like I confused myself - thanks for catching that.

[AayushSabharwal]

Thanks for merging! Would it be possible to cut a release soon 😅 this is blocking some work in ModelingToolkit.jl.

[mateuszbaran]

Sure, I will make a release soon.