Querying iceberg table is not allowed under hive catalog

[stephen-shelby]

Steps to reproduce the behavior (Required)

1. CREATE TABLE '...'
2. INSERT INTO '....'
3. SELECT '....'

Expected behavior (Required)

Real behavior (Required)

StarRocks version (Required)

• You can get the StarRocks version by executing SQL select current_version()

There may be tables of different types (like iceberg or hive) under hive_db. When we are under hive catalog, we can display different types of tables through show tables or show databases. However, when querying a table that is not a catalog of the current type, we need to give a friendly prompt. For example, we don't allow to query iceberg table when current catalog is hive_catalog.