Pass through nothing strides

[nhz2]

Companion PR to JuliaLang/julia#61807

That PR changes strides to return nothing on non-strided arrays instead of throwing an error.

This PR changes strides of Adjoint and Transpose to pass through nothing if strides(parent) is nothing.

This PR should be merged before JuliaLang/julia#61807 is.

[nhz2]

st[1]*Int(length(A.parent)) should match stride(A.parent, 2) since the parent is an abstract vector: https://github.com/JuliaLang/julia/blob/201e056e9ee2398f01ecd2f104f9d8000b04d195/base/abstractarray.jl#L602

JuliaLang/julia#30432 has this return (1, st[1]). The first stride should not get used, so in theory its value shouldn't matter.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.37%. Comparing base (81a3a0d) to head (2ce35a1).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1610      +/-   ##
==========================================
- Coverage   94.39%   94.37%   -0.03%     
==========================================
  Files          35       35              
  Lines       16050    16062      +12     
==========================================
+ Hits        15151    15159       +8     
- Misses        899      903       +4     

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[stevengj]

Needs to wait on whether JuliaLang/julia#61807 is accepted.