ARROW-9062: [Rust] json reader dictionary support
ARROW-9062: [Rust] json reader dictionary support

Changes in this PR allow the JSON Reader to read into Arrow arrays of type dictionary.

Closes #7379 from svenwb/ARROW-9062-rust-json-read-dictionary

Authored-by: Sven Wagner-Boysen <f3b7f1db69f2febe38619c87034b69b04dfafa9c@signavio.com>
Signed-off-by: Neville Dipale <4e1ab218b24f06847d563ff3773c7517c139f863@gmail.com>

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