Major Description
It should return directly if table exists and ignoreIfExists=true
current logic：
requireDbExists(db) if (tableExists(newTableDefinition.identifier)) { if (!ignoreIfExists) { throw new TableAlreadyExistsException(db = db, table = table) } } else if (validateLocation) { validateTableLocation(newTableDefinition) } externalCatalog.createTable(newTableDefinition, ignoreIfExists)
