Introduce 'options' argument to heap_page_prune()

Currently there is only one option, HEAP_PAGE_PRUNE_MARK_UNUSED_NOW
which replaces the old boolean argument, but upcoming patches will
introduce at least one more. Having a lot of boolean arguments makes
it hard to see at the call sites what the arguments mean, so prefer a
bitmask of options with human-readable names.

Author: Melanie Plageman <melanieplage...@gmail.com>
Author: Heikki Linnakangas <heikki.linnakan...@iki.fi>
Discussion: 
https://www.postgresql.org/message-id/20240401172219.fngjosaqdgqqvg4e@liskov

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/3d0f730bf19fbc70cca58818c1ad7415e5aa7d62

Modified Files
--------------
src/backend/access/heap/pruneheap.c  | 11 ++++++-----
src/backend/access/heap/vacuumlazy.c |  9 ++++++---
src/include/access/heapam.h          |  5 ++++-
3 files changed, 16 insertions(+), 9 deletions(-)

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