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This commit implements a new replication command called ALTER_REPLICATION_SLOT and a corresponding walreceiver API function named walrcv_alter_slot. Additionally, the CREATE_REPLICATION_SLOT command has been extended to support the failover option. These new additions allow the modification of the failover property of a replication slot on the publisher. A subsequent commit will make use of these commands in subscription commands and will add the tests as well to cover the functionality added/changed by this commit. Author: Hou Zhijie, Shveta Malik Reviewed-by: Peter Smith, Bertrand Drouvot, Dilip Kumar, Masahiko Sawada, Nisha Moond, Kuroda, Hayato, Amit Kapila Discussion: https://postgr.es/m/514f6f2f-6833-4539-39f1-96cd1e011f23@enterprisedb.com