[JDBC] Make date/time to be encoded allways as the string

[chernser]

Summary

• Make java.sql.Date & java.sql.Time to be encoded in same way when passed to setObject() methods and setTime(), setDate() methods. Previously last two were converted to unix timestamp value. As time and date do not care timezone and represent only time values no conversion should happen on write.
• This fixes correct data type in result query.

Closes: #2381
Closes: #2557

Checklist

Delete items not relevant to your PR:

• Closes #
• 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

[github-actions]

This pull request has been automatically marked as stale because it has not had activity in the last 30 days. It will be closed in 2 weeks if no further activity occurs. Please feel free to give a status update or ping for review. Thank you for your contributions!