zstd compression

zstd compression allows for reducing the size of payloads with repeating
elements. Pretty printed json is one very specific case where we would
prefer to not change the behavior, b

zstd compression

zstd compression allows for reducing the size of payloads with repeating
elements. Pretty printed json is one very specific case where we would
prefer to not change the behavior, but would also like to avoid the
overhead of TLS compression.

When ztd is present, the webserver will look for the Accepts-Encoding
header to contain zstd, and if it does, compress the payload before
sending.

Tested:
Webui loads correctly, and shows zstd being used for download.
Redfish service validator runs. (does not support zstd)
Unit tests pass.

Change-Id: Ic575911fea70d218d1efb4df030d3cc098f1ecd0
Signed-off-by: Ed Tanous <etanous@nvidia.com>

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