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Store logical replication origin in KV storage ## Problem See #6977 ## Summary of changes * Extract origin_lsn from commit WAl record * Add ReplOrigin key to KV storage and store origin_lsn * In basebackup replace snapshot origin_lsn with last committed origin_lsn at basebackup LSN ## Checklist before requesting a review - [ ] I have performed a self-review of my code. - [ ] If it is a core feature, I have added thorough tests. - [ ] Do we need to implement analytics? if so did you add the relevant metrics to the dashboard? - [ ] If this PR requires public announcement, mark it with /release-notes label and add several sentences in this section. ## Checklist before merging - [ ] Do not forget to reformat commit message to not include the above checklist --------- Signed-off-by: Alex Chi Z <chi@neon.tech> Co-authored-by: Konstantin Knizhnik <knizhnik@neon.tech> Co-authored-by: Alex Chi Z <chi@neon.tech>