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Neville DipaleKrisztián Szűcs
bd57703b702
Neville Dipale authored and Krisztián Szűcs committed 28bc3d10201
ARROW-4556: [Rust] Preserve JSON field order when inferring schema

Uses the `preserve-order` feature in `serde_json`, which is required to guarantee that we iterate through JSON records' keys in their provided order.
Adds `crate indexmap`, which `serde_json` already uses.

Author: Neville Dipale <nevilledips@gmail.com>

Closes #3702 from nevi-me/arrow-4556 and squashes the following commits:

5ffbc723 <Neville Dipale> fmt
5de965ae <Neville Dipale> ARROW-4556:  Preserve JSON field order when inferring schema