Add JSON Type

[SpencerTorres]

PR text is pending update

Note: There are some server-side bugs that need to be fixed/merged, including a protocol update. However, this PR can still be reviewed as-is.

Summary

Implement JSON column type. Fully resolves #1430.

Usage

The user can use JSON in 3 ways:

1. By using the new clickhouse.JSON type to assemble JSON data by path strings.
2. By using a struct or map. The struct can be any nested structure, but the map must be map[string]any.
3. By using strings. In this mode the user handles their own json.(Un)Marshal and the strings get sent to the server as-is.

The JSON column also supports the clickhouse.Dynamic and clickhouse.DynamicWithType type for handling a path with multiple data types. Structs can also include a tag to specify type, such as json:"my_field" chType:"Array(String)".

See examples folder for sample code.

Checklist

Delete items not relevant to your PR:

• Unit and integration tests covering the common scenarios were added
• A human-readable description of the changes was provided to include in CHANGELOG
• For significant changes, documentation in https://github.com/ClickHouse/clickhouse-docs was updated with further explanations or tutorials