Describe the proposal

There exists type mapping issues for data type varchar/type between Gravitino and Trino, we need to refine it. for more please see
#2035
https://docs.google.com/document/d/1xNkl4Y2t8Bfb8UOOdGBhyQr5DDreAOLmK8FOWiIDiQM/edit

Task list

• Optimize varchar/char mapping between Gravitino JDBC catalog and Trino #2357
• Optimize varchar/char mapping between Gravitino Hive catalog and Trino #2568
• Optimize varchar/char mapping between Gravitino Iceberg catalog and Trino #2569