pg_walinspect: Add pg_get_wal_fpi_info()

This function is able to extract the full page images from a range of
records, specified as of input arguments start_lsn and end_lsn.  Like
the other functions of this module, an error is returned if using LSNs
that do not reflect real system values.  All the FPIs stored in a single
record are extracted.

The module's version is bumped to 1.1.

Author: Bharath Rupireddy
Reviewed-by: Bertrand Drouvot
Discussion: 
https://postgr.es/m/CALj2ACVCcvzd7WiWvD=6_7nbvvb_r6g0egsxl4f8vosai6s...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/c31cf1c03d01ce86f20bef8c980fe56a257b3b4b

Modified Files
--------------
contrib/pg_walinspect/Makefile                    |   2 +-
contrib/pg_walinspect/expected/pg_walinspect.out  |  44 ++++++++-
contrib/pg_walinspect/meson.build                 |   1 +
contrib/pg_walinspect/pg_walinspect--1.0--1.1.sql |  24 +++++
contrib/pg_walinspect/pg_walinspect.c             | 111 ++++++++++++++++++++++
contrib/pg_walinspect/pg_walinspect.control       |   2 +-
contrib/pg_walinspect/sql/pg_walinspect.sql       |  33 ++++++-
doc/src/sgml/pgwalinspect.sgml                    |  32 +++++++
8 files changed, 245 insertions(+), 4 deletions(-)

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