feat: add native-tls support

[brianheineman]

RFC: Should the feature flags be named native-tls / rustls-tls to better align with the reqwest library where these features are being enabled, or tls-native-tls / tls-rustls to align calling libraries like sqlx (e.g. https://github.com/launchbadge/sqlx/blob/main/Cargo.toml#L79-L81)...?

[github-actions[bot]]

Bencher

Report	Thu, May 30, 2024 at 21:22:16 UTC
Project	theseus-rs/postgresql-embedded
Branch	native-tls-support
Testbed	localhost

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Benchmark	Latency	Latency Results nanoseconds (ns)
extract	➖ (view plot)	152,880.00
lifecycle	➖ (view plot)	1,151,900,000.00

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Codecov Report

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

Project coverage is 99.53%. Comparing base (18692bb) to head (717eb1d).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #71 +/- ## ======================================= Coverage 99.53% 99.53% ======================================= Files 57 57 Lines 7522 7522 ======================================= Hits 7487 7487 Misses 35 35 ```

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