Add new JSON examples with ClickHouse 24.10

[slvrtrn]

Summary

This PR adds a new JSON data type usage example with ClickHouse 24.10, which allows storing/reading it as a string. It is related to #144; I am not sure if we should support "proper" decoding, so if this string use case is enough for now, maybe we can close that issue.

Checklist

• A human-readable description of the changes was provided so that we can include it in CHANGELOG later
• For significant changes, documentation in README and https://github.com/ClickHouse/clickhouse-docs was updated with further explanations or tutorials