Forward view to parent for PseudoBlockArray

[jishnub]

This might help in dispatching to efficient methods for StridedArrays:

julia> B = PseudoBlockArray(collect(reshape(1:36,6,6)), [1,2,3], [1,2,3])
3×3-blocked 6×6 PseudoBlockMatrix{Int64}:
 1  │   7  13  │  19  25  31
 ───┼──────────┼────────────
 2  │   8  14  │  20  26  32
 3  │   9  15  │  21  27  33
 ───┼──────────┼────────────
 4  │  10  16  │  22  28  34
 5  │  11  17  │  23  29  35
 6  │  12  18  │  24  30  36

julia> view(B, Block(2,2))
2×2 view(::Matrix{Int64}, 2:3, 2:3) with eltype Int64:
 8  14
 9  15

julia> view(B, 2:3, 2:3) # new in this PR, matches the above
2×2 view(::Matrix{Int64}, 2:3, 2:3) with eltype Int64:
 8  14
 9  15

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.54%. Comparing base (ee08389) to head (0b44040).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #290      +/-   ##
==========================================
+ Coverage   94.53%   94.54%   +0.01%     
==========================================
  Files          16       16              
  Lines        1501     1504       +3     
==========================================
+ Hits         1419     1422       +3     
  Misses         82       82              

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