Add Examples for batch.Column(n).AppendRow in columnar_insert.go

[achmad-dev]

Summary

Add examples demonstrating the usage of batch.Column(n).AppendRow in the columnar_insert.go file.

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

[CLAassistant]

All committers have signed the CLA.

[jkaflik]

Thanks for your contribution! LGTM