feat: snappy compression

[merklefruit]

• After feat: Pub/Sub auto-decompression #45

Overview

Added support for the Snappy compression algorithm with the snap crate.

Benchmark

It appears snappy is super fast, while providing a more modest compression than gzip and zstd.
Here are the comparative results for a 280kb SSZ encoded Ethereum beacon block:

uncompressed data size: 287038 bytes
gzip compression shrank the data by 334.39% in 4.456125ms
zstd compression shrank the data by 389.28% in 2.543625ms
snappy compression shrank the data by 202.82% in 368.083µs
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gzip decompression took 1.022083ms
zstd decompression took 449.75µs
snappy decompression took 247.959µs