feat: lz4 compression

[merklefruit]

LZ4 is even faster than Snappy while keeping the same compression ratio. Very impressive!

Mainnet Capella beacon block compression & decompression test results:

uncompressed data size: 287038 bytes
gzip compression shrank the data by 334.39% in 4.06275ms
zstd compression shrank the data by 389.28% in 2.413542ms
snappy compression shrank the data by 202.82% in 454.625µs
lz4 compression shrank the data by 199.92% in 333.125µs
------
gzip decompression took 849.875µs
zstd decompression took 405.666µs
snappy decompression took 152.25µs
lz4 decompression took 128.833µs

Additional changes

• chore: moved compression-related crates to msg-wire instead of workspace manifest
• chore: forgot to export the connection module in lib.rs, made imports cleaner.

[mempirate]

This looks great, could you add lz4 to the book as a supported compression algo?

[merklefruit]

@mempirate yep!

[mempirate]

LGTM