Kafka connector: when the data type is wrong, there is no error log

**Bug Description**
+ version: v0.6.0
+ When the data type is wrong, synchronization will not occur, but there is no error
+ When the value of pk.fields is not an index column, it cannot be deleted, but there is no error log

**Expected Behavior**

Check the connect.log for error logs

**Steps to Reproduce**

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Look for Kafka connector code in the OpenMLDB repository, likely under connectors or sync modules. Examine logging logic around data type validation and primary key field handling. Run the connector with a misconfigured data type or non-index PK field to see if errors are silently dropped.

Scritto dal modello di indicizzazione a partire dal testo della issue.