JSON column support on native protocol

Hi, any plans for full JSON support via native protocol? (uint8_serialization_version=0) ?

I've made a little fork that can only insert JSON columns into server https://github.com/ClickHouse/clickhouse-cpp/compare/master...mrAndersen:clickhouse-cpp-json-read:master maybe we can merge this, so at least driver will have the ability to insert?

Start by reviewing the linked fork comparison and the repository's native-protocol handling; the issue names no specific files or tests. Clarify whether the goal is insertion only or full JSON column support, then define completion around the supported JSON operations and corresponding verification.

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