Add CompressedSerializer for compression of other result serializers

[zanieb]

Adds CompressedSerializer similar to the one in v1 which lets you use arbitrary (defaults to lzma) compression libraries to compress the bytes returned by an arbitrary serializer.

Documentation preview

Example

@flow(result_serializer="compressed/json")
...

@flow(result_serializer="compressed/pickle")
...

@flow(result_serializer=CompressedSerializer(compressionlib="zlib", serializer="pickle"))
...

Checklist

• This pull request references any related issue by including "closes <link to issue>"
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• This pull request includes tests or only affects documentation.
• This pull request includes a label categorizing the change e.g. fix, feature, enhancement

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[tpdorsey]

Minor edit suggestions. Looks good.

[chrisguidry]

Lovely!

[chrisguidry]

Love this!

[zanieb]

I tried to do a generalized dispatch implementation but it got really scary :D