Forward diagview for adjoint/transpose to parent

[jishnub]

After this,

julia> B = reshape([1:9;], 3, 3)
3×3 Matrix{Int64}:
 1  4  7
 2  5  8
 3  6  9

julia> diagview(B', 1)
2-element view(::Vector{Int64}, 2:4:6) with eltype Int64:
 2
 6

The view directly indexes into the parent, and the adjoint layer is removed. This also makes the view linearly indexed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.81%. Comparing base (c64c328) to head (1ab987c).
Report is 7 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1373   +/-   ##
=======================================
  Coverage   93.81%   93.81%           
=======================================
  Files          34       34           
  Lines       15717    15719    +2     
=======================================
+ Hits        14745    14747    +2     
  Misses        972      972           

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