Make adjoint/transpose for Diagonal/Bidiagonal lazy
#1368
Merged
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Currently,
adjointandtransposefor a blockDiagonaland a blockBidiagonalmatrix allocates the diagonals. This was not intentional, and we may use lazy wrappers instead that ensures that the result shares memory with the original array, which is what the documentation states. After this PR, mutating theadjointwill automatically mutate the parent array.