Add BroadcastStyle for ReshapedArray of a LayoutArray

[DanielVandH]

This allows e.g.

julia> v = Accumulate(*, 1:10); Base.BroadcastStyle(typeof(vec(Vcat(v', v'))))
LazyArrays.LazyArrayStyle{2}()

(and, after JuliaArrays/LazyArrays.jl#391, this would return CachedArrayStyle{2}())

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.80%. Comparing base (1e4fcc1) to head (3ea20ae).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #268       +/-   ##
===========================================
+ Coverage    0.00%   89.80%   +89.80%     
===========================================
  Files          11       11               
  Lines        1858     1951       +93     
===========================================
+ Hits            0     1752     +1752     
+ Misses       1858      199     -1659     

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