Add Snappy & Lz4 Compression

[awr]

Currently, only gzip is supported.

[awr]

Consider using https://github.com/Kintaro/SnappySharp for the compression.

[awr]

Another option is https://github.com/jeffesp/Snappy.Sharp, but there are concerning open issues wrt data not lining up (see jeffesp/Snappy.Sharp#8)

[awr]

https://github.com/DavidRouyer/Snappy is another option

[awr]

Unfortunately Snappy.Standard doesn't support net462

[awr]

Should be done for #16

[awr]

Kafka now has support for Lz4, which seems like a compelling option.

One possible option here is https://github.com/MiloszKrajewski/lz4net, although we'd need a version based on .net standard 1.3 or something similar

[awr]

Snappy support is now working.