extract zst as a feature (#38)

Co-authored-by: Yuri Astrakhan <[email protected]>

Cargo.toml

@@ -17,6 +17,7 @@ mmap-async-tokio = ["__async", "dep:fmmap", "fmmap?/tokio-async"]
 s3-async-native = ["__async-s3", "__async-s3-nativetls"]
 s3-async-rustls = ["__async-s3", "__async-s3-rustls"]
 tilejson = ["dep:tilejson", "dep:serde", "dep:serde_json"]
+zstd = [ "async-compression/zstd" ]
 
 # Forward some of the common features to reqwest dependency
 reqwest-default = ["reqwest?/default"]
@@ -33,7 +34,7 @@ __async-s3-rustls = ["rust-s3?/tokio-rustls-tls"]
 
 [dependencies]
 # TODO: determine how we want to handle compression in async & sync environments
-async-compression = { version = "0.4", features = ["gzip", "zstd", "brotli"] }
+async-compression = { version = "0.4", features = ["gzip", "brotli"] }
 bytes = "1"
 fmmap = { version = "0.3", default-features = false, optional = true }
 hilbert_2d = "1"