Add system view pg_ident_file_mappings

Michael Paquier <michael@paquier.xyz>

Commit: a2c84990bea7beadb599d02328190e2a763dcb86
Author: Michael Paquier <michael@paquier.xyz>
Date: 2022-03-29T01:15:48Z
Releases: 15.0
Add system view pg_ident_file_mappings

This view is similar to pg_hba_file_rules view, except that it is
associated with the parsing of pg_ident.conf.  Similarly to its cousin,
this view is useful to check via SQL if changes planned in pg_ident.conf
would work upon reload or restart, or to diagnose a previous failure.

Bumps catalog version.

Author: Julien Rouhaud
Reviewed-by: Aleksander Alekseev, Michael Paquier
Discussion: https://postgr.es/m/20220223045959.35ipdsvbxcstrhya@jrouhaud

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