Add support for zstd compression

[luxe]

Add support for bazel --experimental_remote_cache_compression flag.
Add integration test to evaluate compression.

These files were taken from bazel source code: src/main/java/build/buildfarm/common/ZstdCompressingInputStream.java src/main/java/build/buildfarm/common/ZstdDecompressingOutputStream.java

https://docs.google.com/document/d/15GHaui2roeulY7NTS0xCi_kF03MCpVEIPheWvVMVoxQ/edit#heading=h.t2kdo79ahls