zSTD Support

[cliffburdick]

Hi, is there a reason zstd support isn't in this client? Would you be willing to accept a PR for it or is there a reason it's purposely left out?

[Enmk]

Generally, all PRs are welcome. But just to clarify, do you want to implement an additional client-server protocol compression method?

[alexey-milovidov]

@Enmk This compression method is already supported in ClickHouse, look at the
network_compression_method
network_zstd_compression_level
settings.

[cliffburdick]

@Enmk This compression method is already supported in ClickHouse, look at the
network_compression_method
network_zstd_compression_level
settings.

Yes, I should have clarified that it's already supported on the server, and the client is the only one lacking support.

[Enmk]

Great, you are very welcome to add ZSTD support on ClickHouse-cpp side. Also, please make sure to add some tests to the PR 🙏