fix: clickhouse connect error fix

[csunny]

Close #933

Use clickhouse-connect pylib

pip install clickhouse-connect

[csunny]

@Aries-ckt The use of datasource in some places is irregular， such as dbgpt/rag/summary/rdbms_db_summary.py

 columns = []
    for column in conn._inspector.get_columns(table_name):
        if column.get("comment"):
            columns.append(f"{column['name']} ({column.get('comment')})")
        else:
            columns.append(f"{column['name']}")

We should use conn.get_columns(table_name) instead of conn._inspector.get_columns(table_name), the _inspector function is private.

[fangyinc]

r+

[Aries-ckt]

r+

[Aries-ckt]

r+

[fangyinc]

r+