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ARROW-4968: [Rust] Assert that struct array field types match data in…

… From<> method

I initially thought this might also be an issue in the StructBuilder, but I can't reproduce it, so I'm only adding a fix for `StructArray::From<Vec<Field>, Vec<ArrayRef>>`

Author: Krisztián Szűcs <szucs.krisztian@gmail.com>
Author: Neville Dipale <nevilledips@gmail.com>

Closes #4176 from nevi-me/ARROW-4968 and squashes the following commits:

46cd09ea2 <Krisztián Szűcs> remove unnecessary test code
2bf0dd4be <Neville Dipale> ARROW-4968:  Assert that struct array field types match data in From<> method