Add C client tests to catch op_rewriting segfault

[var77]

Added tests with C libpq client to catch the segfault happening on operator rewrite hook.

To add new tests you need to do the following:

1. Create test file under test/c/
2. Include test file in test/runner.c
3. Add test case to test_cases[] in runner.c

[github-actions]

Benchmarks

metric	old	new	pct change
recall (after create)	0.740	0.740	-
recall (after insert)	0.790	0.744	-5.82%
select bulk tps	474.798	508.593	+7.12%
select bulk latency (ms)	15.563	15.582	+0.12%
select bulk latency (stddev ms)	3.889	1.119	-71.23%
create latency (ms)	1192.118	1191.062	-0.09%
insert bulk tps	11.178	11.470	+2.61%
insert bulk latency (ms)	89.451	87.177	-2.54%
insert bulk latency (stddev ms)	3.011	1.535	-49.02%
disk usage (bytes)	6348800.000	6348800.000	-

[codecov]

Codecov Report

Merging #238 (0ebc038) into main (96f50b3) will not change coverage.
Report is 1 commits behind head on main.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #238   +/-   ##
=======================================
  Coverage   77.85%   77.85%           
=======================================
  Files          23       23           
  Lines        1653     1653           
  Branches      410      410           
=======================================
  Hits         1287     1287           
  Misses        185      185           
  Partials      181      181           

Files	Coverage Δ
src/hooks/op_rewrite.c	83.21% <100.00%> (ø)

[Ngalstyan4]

Looks good!

[Ngalstyan4]

looks good. feel free to merge!