Initial support for advisory lock functions

[fulghum]

Adds support for three Postgres advisory lock functions:

• pg_try_advisory_lock()
• pg_advisory_lock()
• pg_advisory_unlock()

A couple TODOs call out follow-ups to make LockSubsystem work better with Postgres' behavior, such as supporting reentrant locking.

Fixes: #1262

[github-actions]

	Main	PR
covering_index_scan_postgres	389.98/s	386.53/s	-0.9%
index_join_postgres	157.55/s	157.80/s	+0.1%
index_join_scan_postgres	189.00/s	189.51/s	+0.2%
index_scan_postgres	12.78/s	12.66/s	-1.0%
oltp_point_select	2847.86/s	2821.41/s	-1.0%
oltp_read_only	1905.64/s	1878.43/s	-1.5%
select_random_points	113.07/s	111.99/s	-1.0%
select_random_ranges	140.71/s	136.72/s	-2.9%
table_scan_postgres	10.51/s	10.36/s	-1.5%
types_table_scan_postgres	5.44/s	5.46/s	+0.3%

[github-actions]

	Main	PR
Total	42090	42090
Successful	15727	15727
Failures	26363	26363
Partial Successes1	5198	5198

	Main	PR
Successful	37.3652%	37.3652%
Failures	62.6348%	62.6348%

Footnotes

1. These are tests that we're marking as Successful, however they do not match the expected output in some way. This is due to small differences, such as different wording on the error messages, or the column names being incorrect while the data itself is correct. ↩

[zachmu]

LGTM, good start