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Refactor code of pg_stat_get_wal() building result tuple

Refactor code of pg_stat_get_wal() building result tuple

This commit adds to pgstatfuncs.c a new routine called
pg_stat_wal_build_tuple(), helper routine for pg_stat_get_wal(). This
is in charge of filling one tuple based on the contents of
PgStat_WalStats retrieved from pgstats.

This refactoring will be used by an upcoming patch introducing
backend-level WAL statistics, simplifying the main patch. Note that
it is not possible for stats_reset to be NULL in pg_stat_wal; backend
statistics need to be able to handle this case.

Author: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
Discussion: https://postgr.es/m/Z3zqc4o09dM/Ezyz@ip-10-97-1-34.eu-west-3.compute.internal

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