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ARROW-7836: [Rust] "allocate_aligned"/"reallocate" need to initialize memory to avoid UB

Closes #6422 from paddyhoran/init and squashes the following commits:

c90f15354 <Paddy Horan> Addressed review comments.
6a6d0f423 <Paddy Horan> Initialize memory at allocation time.

Authored-by: Paddy Horan <paddyhoran@hotmail.com>
Signed-off-by: Paddy Horan <paddyhoran@hotmail.com>