test: add functional and benchmark tests

[github-actions[bot]]

Bencher

Report	Fri, March 29, 2024 at 23:24:05 UTC
Project	theseus-rs/rsql
Branch	add-tests
Testbed	localhost

Benchmark	Latency	Latency Results nanoseconds (ns)
postgres-embedded	➖ (view plot)	805580000.000
postgresql-embedded	➖ (view plot)	805670000.000
rusqlite	➖ (view plot)	263340.000
sqlite	➖ (view plot)	498890.000

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.09%. Comparing base (8f98e36) to head (47d2341).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #95 +/- ## ========================================== + Coverage 96.03% 96.09% +0.06% ========================================== Files 73 73 Lines 8011 8067 +56 ========================================== + Hits 7693 7752 +59 + Misses 318 315 -3 ```

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