Add flag to disable operator rewriting hooks and make pgvector compatible

[var77]

• Added lantern.pgvector_compat variable which when set to TRUE will disable the <-> operator rewriting hooks and enable <=> and <+> operator usages for cosine and hamming distances.
• Added operators for cosine (<=>) and hamming (<+>) distances with corresponding operator classes. These operators will only work if lantern.pgvector_compat=TRUE
• Added operators for cosine and hamming distances for vector type.
• Added update file to create/recreate the operator classes, as this operation will drop the existing indexes I have added reindexing logic in update file
• In CI added function to run pgvector tests with lantern.pgvector_compat=TRUE, so we will be sure that no operator rewriting is happening

[github-actions]

Benchmarks

metric	old	new	pct change
recall (after create)	0.740	0.740	-
recall (after insert)	0.750	0.778	+3.73%
select bulk tps	487.436	485.806	-0.33%
select bulk latency (ms)	15.557	15.863	+1.97%
select bulk latency (stddev ms)	1.866	3.717	+99.20%
create latency (ms)	1195.214	1197.182	+0.16%
insert bulk tps	11.502	11.589	+0.75%
insert bulk latency (ms)	86.931	86.282	-0.75%
insert bulk latency (stddev ms)	1.991	3.286	+65.04%
disk usage (bytes)	6348800.000	6348800.000	-

[codecov]

Codecov Report

Merging #240 (fbff1d0) into main (37a8519) will decrease coverage by 0.18%.
The diff coverage is 81.08%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #240      +/-   ##
==========================================
- Coverage   77.85%   77.68%   -0.18%     
==========================================
  Files          23       23              
  Lines        1653     1685      +32     
  Branches      410      415       +5     
==========================================
+ Hits         1287     1309      +22     
- Misses        185      191       +6     
- Partials      181      185       +4     

Files	Coverage Δ
src/hooks/executor_start.c	80.43% <100.00%> (-7.94%)	⬇️
src/hooks/op_rewrite.c	83.21% <ø> (ø)
src/hnsw.c	81.98% <96.15%> (+1.36%)	⬆️
src/hooks/post_parse.c	87.50% <0.00%> (-1.25%)	⬇️
src/hnsw/options.c	82.53% <28.57%> (-2.47%)	⬇️

... and 2 files with indirect coverage changes

[Ngalstyan4]

Good! This was quick:)