Expose some internals to allow Reading/Writing native blocks from STDIN/STDOUT

[arnaudbriche]

Hi,

My use case is writing Clickhouse UDF in Rust.
In order to have both high-performance and binary safety, I want Clickhouse to talk to my UDF binary (via STDIN/STDOUT).
This crate does implement Native clickhouse ser/deser, but unfortunately, I don't see anything in the public API that would
allow to ser/deser from a stream (here STDIN/STDOUT).

Would you be ok exposing some of the internals so that this becomes possible ?