pgsql: Revert: Implement pg_wal_replay_wait() stored procedure

Revert: Implement pg_wal_replay_wait() stored procedure

This commit reverts 06c418e163, e37662f221, bf1e650806, 25f42429e2,
ee79928441, and 74eaf66f98 per review by Heikki Linnakangas.

Discussion: https://postgr.es/m/b155606b-e744-4218-bda5-29379779da1a%40iki.fi

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/772faafca1b288c4dd66b7150a7831c27b768003

Modified Files
--------------
doc/src/sgml/func.sgml                          | 113 --------
src/backend/access/transam/xact.c               |   6 -
src/backend/access/transam/xlog.c               |   7 -
src/backend/access/transam/xlogrecovery.c       |  11 -
src/backend/catalog/system_functions.sql        |   3 -
src/backend/commands/Makefile                   |   3 +-
src/backend/commands/meson.build                |   1 -
src/backend/commands/waitlsn.c                  | 337 ------------------------
src/backend/lib/pairingheap.c                   |  18 +-
src/backend/storage/ipc/ipci.c                  |   3 -
src/backend/storage/lmgr/proc.c                 |   6 -
src/backend/utils/activity/wait_event_names.txt |   2 -
src/include/catalog/catversion.h                |   2 +-
src/include/catalog/pg_proc.dat                 |   5 -
src/include/commands/waitlsn.h                  |  77 ------
src/include/lib/pairingheap.h                   |   3 -
src/include/storage/lwlocklist.h                |   1 -
src/test/recovery/meson.build                   |   1 -
src/test/recovery/t/043_wal_replay_wait.pl      |  97 -------
src/tools/pgindent/typedefs.list                |   2 -
20 files changed, 4 insertions(+), 694 deletions(-)