pg_recvlogical: Add --failover option.

pg_recvlogical: Add --failover option.

This new option instructs pg_recvlogical to create the logical
replication slot with the failover option enabled. It can be used in
conjunction with the --create-slot option.

Author: Hayato Kuroda <[email protected]>
Reviewed-by: Michael Banck <[email protected]>
Reviewed-by: Masahiko Sawada <[email protected]>
Discussion: https://postgr.es/m/OSCPR01MB14966C54097FC83AF19F3516BF5AC2@OSCPR01MB14966.jpnprd01.prod.outlook.com