Some RELKIND macro refactoring
Add more macros to group some RELKIND_* macros:
- RELKIND_HAS_PARTITIONS()
- RELKIND_HAS_TABLESPACE()
- RELKIND_HAS_TABLE_AM()
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Reviewed-by: Alvaro Herrera <alvherre@alvh.no-ip.org>
Discussion: https://www.postgresql.org/message-id/flat/
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