ARROW-6045: [C++] Add benchmark for double and float encoding/decoding, as well as NaN encoding
ARROW-6045: [C++] Add benchmark for double and float encoding/decoding, as well as NaN encoding

Was testing report that NaN encoding was slow. Couldn't reproduce it, but may as well have the benchmark.

Closes #4915 from itamarst/parquet-nan-encoding and squashes the following commits:

bca37aae1 <Itamar Turner-Trauring> Add benchmark for double and float encoding/decoding, as well as NaN encoding for double and float.

Authored-by: Itamar Turner-Trauring <6906be8b99a659e743674ece90805ac5611ad258@itamarst.org>
Signed-off-by: Wes McKinney <3be70eed0275ec2606f002bff3514252e145d204@apache.org>

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