[YSQL] Partition schema is not defined for table "sys.catalog" in YugaByte

[nocaway]

Jira Link: DB-4848
Each table in YSQL is stored in YugaByte under a specific partition schema, either HASH or RANGE.
However, the table "sys.catalog" definition does not specify the partition schema.
Other YSQL system tables also have the same issue.

Here is its full definition in Protobuf format.

name: "sys.catalog"
version: 0
schema {
  columns {
    id: 10
    name: "entry_type"
    type {
      main: INT8
    }
    is_key: true
    is_nullable: false
    is_static: false
    is_counter: false
    sorting_type: 1
    order: 0
  }
  columns {
    id: 11
    name: "entry_id"
    type {
      main: BINARY
    }
    is_key: true
    is_nullable: false
    is_static: false
    is_counter: false
    sorting_type: 1
    order: 0
  }
  columns {
    id: 12
    name: "metadata"
    type {
      main: BINARY
    }
    is_key: false
    is_nullable: false
    is_static: false
    is_counter: false
    sorting_type: 0
    order: 0
  }
  table_properties {
    contain_counters: false
    is_transactional: false
    consistency_level: STRONG
    use_mangled_column_name: false
    is_ysql_catalog_table: false
    is_backfilling: false
  }
  colocated_table_id {
  }
}
state: RUNNING
table_type: YQL_TABLE_TYPE
namespace_id: "00000000000000000000000000000002"

[nocaway]

Since "sys.catalog" has TWO ASC columns and occupies one tablet, its schema can be defined as COLOCATED and RANGE-PARTITIONING