docs: add postgres driver and sqlx examples

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Bencher

Report	Thu, February 22, 2024 at 19:05:07 UTC
Project	theseus-rs/postgresql-embedded
Branch	add-driver-examples
Testbed	localhost

Benchmark	Latency	Latency Results nanoseconds (ns)
extract	➖ (view plot)	208610000.000
lifecycle	➖ (view plot)	744130000.000

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Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (ee496e1) 98.32% compared to head (22dfcfa) 98.36%.

Files	Patch %	Lines
postgresql_archive/src/archive.rs	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #29 +/- ## ========================================== + Coverage 98.32% 98.36% +0.03% ========================================== Files 53 55 +2 Lines 6516 6652 +136 ========================================== + Hits 6407 6543 +136 Misses 109 109 ```

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