Add more information for WAL records of hash index AMs

hashdesc.c was missing a couple of fields in its record descriptions, as
of:
- is_prev_bucket_same_wrt for SQUEEZE_PAGE.
- procid for INIT_META_PAGE.
- old_bucket_flag and new_bucket_flag for SPLIT_ALLOCATE_PAGE.

The author has noted the first hole, and I have spotted the others while
double-checking this area of the code.  Note that the only data missing
now are the offsets stored in VACUUM_ONE_PAGE.  We could perhaps add
them, if somebody sees value in this data, even if it makes the output
larger.  These are discarded here.

Author: Kirill Reshke <[email protected]>
Discussion: 
https://postgr.es/m/CALdSSPjc-OVwtZH0Xrkvg7n=2zwdbmjzqrm_ed_cfjiazuk...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/528dadf691df3023fbb0bd71da5c6087c2d49d6a

Modified Files
--------------
src/backend/access/rmgrdesc/hashdesc.c | 15 ++++++++++-----
1 file changed, 10 insertions(+), 5 deletions(-)

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