[Feature] support paimon jdbc catalog

See iceberg. Custom catalogs are supported. For example, users can customize catalogs based on jdbc. Table metadata can be stored in a relational database, independent of hive meta.

https://iceberg.apache.org/docs/latest/jdbc/

Start by reading the linked Iceberg JDBC catalog documentation and locating Paimon's existing custom-catalog support; the issue names no file or test. Done means Paimon supports a JDBC-backed catalog whose table metadata is stored in a relational database independently of Hive metadata.

Written by the indexing model from the issue text.