How to Write a Kafka Connector with Proper Configuration Handling

What this post added

This post introduces detailed techniques for building Kafka connectors with proper configuration handling. It explains the use of `ConfigDef` for defining parameters, `ConfigDef.Validator` for ensuring value correctness, and `ConfigDef.Recommender` for providing dynamic, context-aware valid value suggestions. It also details how to override the `validate()` method to handle complex inter-configuration dependencies, which is a crucial aspect of connector development.