[EPIC] Supporting new Iceberg REST endpoints

[FANNG1]

Describe the proposal

Supporting new Iceberg REST endpoints

Task list

• [Subtask] upgrade Iceberg version to 1.7 in Iceberg REST server version #6337
• support credential refresh endpoint
• support scan planning endpoint
• [Subtask] Gravitino Iceberg REST server express supported endpoints via endpoint field in ConfigResponse #6395