zstd decompression/compression should be added a standard pekko IO stream as its far superior to gzip/lzma in every way. The API design should be the same as it is for gzip.

Doing this requires using https://github.com/luben/zstd-jni, which uses the standard reference C library via JNI (unfortunately there is no such implementation in native Java and even if there would be I am not sure it would be as fast as the C one).