Add array type parameter to DefaultArrayInterface

[mtfishman]

EDIT: This description is a bit outdated since it is all handled by just adding a new type parameter to DefaultArrayInterface but the idea is still relevant:

This adds another AbstractArrayInterface subtype called ArrayInterface. It is analogous to Base.Broadcast.ArrayStyle. Specifically, it can act as the array style for any array type by storing the array type as a type parameter.

In the current PR, when you call interface(A::AbstractArray), it has the following behavior:

1. It unwraps any array type wrappers from typeof(A).
2. If the unwrapped type is Array or an abstract array type like AbstractArray, it constructs a DefaultArrayInterface.
3. Otherwise, it creates an ArrayStyle with the unwrapped array type of A as a type parameter, though to canonicalize the type it strips off all type parameters.

Then, similar(::ArrayStyle, T::Type, ax::Tuple) sets the element type of the stored array type (using TypeParameterAccessors.set_eltype) and tries to construct the array with similar(A{T}, ax). This of course can go wrong, in which case that array type should define a custom interface. However, this works for a lot of cases automatically. The motivation is ITensor/BlockSparseArrays.jl#138, where I want the interface system to automatically work for GPU array types without having to make a custom interface for each one, this PR handles that case. We may want custom GPU array interfaces anyway at some point, for example to store information about the device, storage mode like unified memory, etc., but for now I think it is nice to have something that "just works".

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.89%. Comparing base (bb0a449) to head (c53cf32).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #44      +/-   ##
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+ Coverage   72.23%   73.89%   +1.65%     
==========================================
  Files          11       11              
  Lines         371      383      +12     
==========================================
+ Hits          268      283      +15     
+ Misses        103      100       -3     

Flag	Coverage Δ
docs	27.03% <0.00%> (-0.88%)	⬇️

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[mtfishman]

In the latest, I've merged ArrayStyle into DefaultArrayStyle, so now DefaultArrayStyle stores an extra type parameter for the array type. That seems to work well and is clearly a lot less code. I haven't seen any downsides yet, we'll see if there are any issues with downstream tests.