Add basic select benchmarks

[AlekseiLitkovetc]

Hello @tpolecat,

Thank you so much for such a cool data access library. I see how much effort and time was invested in researching this topic and implementing such a wonderful tool as Skunk. Thank you 🙏

Recently, I noticed that the Skunk repository doesn't have benchmarks. If you don't mind, can we add some basic selection tests similar to those in the Doobie repository? In case this work is relevant, we can also consider adding more tests (for example, to test DML operations). And I will be glad to help with it.

Thank you in advance!

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 35 lines in your changes are missing coverage. Please review.

Project coverage is 84.10%. Comparing base (3f99149) to head (a85ead3).

Files	Patch %	Lines
...bench/src/main/scala/skunk/bench/SelectBench.scala	0.00%	35 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1048      +/-   ##
==========================================
- Coverage   85.54%   84.10%   -1.45%     
==========================================
  Files         135      136       +1     
  Lines        2041     2076      +35     
  Branches      239      243       +4     
==========================================
  Hits         1746     1746              
- Misses        295      330      +35     

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[mpilquist]

This sounds great, thanks!

[AlekseiLitkovetc]

Thank you!