feat: Enable zstd

In Iceberg we allow Avro metadata to be compressed using
zstandard. To also support this in Iceberg Rust we need to
enable the zstandard feature:

https://github.com/apache/avro-rs/blob/main/avro/README.md#installing-the-library

Author: Fokko

Cargo.lock

@@ -40,7 +40,7 @@ rust-version = "1.87"
 
 [workspace.dependencies]
 anyhow = "1.0.72"
-apache-avro = "0.20"
+apache-avro = { version = "0.20", features = ["zstandard"] }
 array-init = "2"
 arrow-arith = { version = "55.1" }
 arrow-array = { version = "55.1" }