Inplace Blockwise outputs on inputs in Numba backend

[ricardoV94]

Description

When we have a Blockwise with the same output shape and type as one of its inputs (such as Cholesky whose signature is "(m,m)->(m,m)") we can overwrite the output in the input buffer.

This is independent of allowing the core_op to destroy the input as done in #1028

This is only relevant for the numba backend after #1015 since the other backends don't give us inplace control and numpy vectorize (used in the Python backend) neither.