add LockPostgreSQL and BenchmarkDistLockers

[leeym]

Add the following two

• LockPostgreSQL implements DistLocker using advisory locks in PostgreSQL
• BenchmarkDistLockers to compare the performance for distributed lockers

goos: darwin
goarch: amd64
pkg: github.com/mennanov/limiters
cpu: Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
BenchmarkDistLockers
2024/03/15 12:55:40 Connected to 127.0.0.1:2181
2024/03/15 12:55:40 authenticated: id=72058590880071686, timeout=4000
2024/03/15 12:55:40 re-submitting `0` credentials after reconnect
BenchmarkDistLockers/LockPostgreSQL
BenchmarkDistLockers/LockPostgreSQL-12               626           1616118 ns/op
BenchmarkDistLockers/LockEtcd
BenchmarkDistLockers/LockEtcd-12                     177           6754712 ns/op
BenchmarkDistLockers/LockConsul
BenchmarkDistLockers/LockConsul-12                   121           9367934 ns/op
BenchmarkDistLockers/LockZookeeper
BenchmarkDistLockers/LockZookeeper-12                288           4256412 ns/op
BenchmarkDistLockers/LockRedis
BenchmarkDistLockers/LockRedis-12                   1292            928732 ns/op
BenchmarkDistLockers/LockMemcached
BenchmarkDistLockers/LockMemcached-12                716           1639791 ns/op
PASS
ok      github.com/mennanov/limiters    266.516s

It will be easier to review in unified view and hide whitespace.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.01%. Comparing base (c1474e1) to head (1cb64ea).

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #38      +/-   ##
==========================================
+ Coverage   79.90%   80.01%   +0.11%     
==========================================
  Files          12       12              
  Lines        1438     1446       +8     
==========================================
+ Hits         1149     1157       +8     
  Misses        212      212              
  Partials       77       77              

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[leeym]

It is flaky and doesn't work as expected.