feat(protocol): implement brotli buffer for compressor

[SkandaBhat]

Fixes #176

The implementation ended up being quite similar to #14.

Note that one test fails: compression::brotli::compress::test::test_compress_batch_brotli but the roundtrip test (compresses, decompresses, and checks if we got the same data) passes. Perhaps we should just test roundtrips and not intermediate compressed vs expected? I assume because of the buffer we have the first few bits off.

[SkandaBhat]

@refcell are the test_compress_batch_brotli and test_compress_brotli expected? Is there a usecase where we should be testing compressed data against expected data?