Introduce "REFRESH SEQUENCES" for subscriptions.

 Introduce "REFRESH SEQUENCES" for subscriptions.
 
 This patch adds support for a new SQL command:
 ALTER SUBSCRIPTION ... REFRESH SEQUENCES
 This command updates the sequence entries present in the
 pg_subscription_rel catalog table with the INIT state to trigger
 resynchronization.
 
 In addition to the new command, the following subscription commands have
 been enhanced to automatically refresh sequence mappings:
 ALTER SUBSCRIPTION ... REFRESH PUBLICATION
 ALTER SUBSCRIPTION ... ADD PUBLICATION
 ALTER SUBSCRIPTION ... DROP PUBLICATION
 ALTER SUBSCRIPTION ... SET PUBLICATION
 
 These commands will perform the following actions:
 Add newly published sequences that are not yet part of the subscription.
 Remove sequences that are no longer included in the publication.
 
 This ensures that sequence replication remains aligned with the current
 state of the publication on the publisher side.
 
 Note that the actual synchronization of sequence data/values will be
 handled in a subsequent patch that introduces a dedicated sequence sync
 worker.
 
 Author: Vignesh C <vignesh21@gmail.com>
 Reviewed-by: Amit Kapila <amit.kapila16@gmail.com>
 Reviewed-by: shveta malik <shveta.malik@gmail.com>
 Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com>
 Reviewed-by: Hayato Kuroda <kuroda.hayato@fujitsu.com>
 Reviewed-by: Dilip Kumar <dilipbalaut@gmail.com>
 Reviewed-by: Peter Smith <smithpb2250@gmail.com>
 Reviewed-by: Nisha Moond <nisha.moond412@gmail.com>
 Reviewed-by: Shlok Kyal <shlok.kyal.oss@gmail.com>
 Reviewed-by: Chao Li <li.evan.chao@gmail.com>
 Reviewed-by: Hou Zhijie <houzj.fnst@fujitsu.com>
 Discussion: https://postgr.es/m/CAA4eK1LC+KJiAkSrpE_NwvNdidw9F2os7GERUeSxSKv71gXysQ@mail.gmail.com