sql: added empty stubs for pg_stat* tables

[jseldess]

PR: cockroachdb/cockroach#67947

From release notes:

Added empty pg_stat* tables on pg_catalog: pg_stat_all_indexes, pg_stat_all_tables, pg_stat_archiver, pg_stat_bgwriter, pg_stat_gssapi, pg_stat_progress_analyze, pg_stat_progress_basebackup, pg_stat_progress_cluster, pg_stat_progress_create_index, pg_stat_progress_vacuum, pg_stat_replication, pg_stat_slru, pg_stat_ssl, pg_stat_subscription, pg_stat_sys_indexes, pg_stat_sys_tables, pg_stat_user_functions, pg_stat_user_indexes, pg_stat_user_tables, pg_stat_wal_receiver, pg_stat_xact_all_tables, pg_stat_xact_sys_tables, pg_stat_xact_user_functions, pg_stat_xact_user_tables, pg_statio_all_indexes, pg_statio_all_sequences, pg_statio_all_tables, pg_statio_sys_indexes, pg_statio_sys_sequences, pg_statio_sys_tables, pg_statio_user_indexes, pg_statio_user_sequences, pg_statio_user_tables. [#67947][#67947] {% comment %}doc{% endcomment %}