feat!: initial postgresql_extensions crate

[brianheineman]

Initial crate to support #47. These changes update the MSRV to 1.80

[github-actions[bot]]

Bencher

Report	Thu, August 1, 2024 at 18:28:38 UTC
Project	theseus-rs/postgresql-embedded
Branch	initial-postgresql-extensions
Testbed	localhost

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Benchmark	Latency	Latency Results nanoseconds (ns)
extract	➖ (view plot)	155,020.00
lifecycle	➖ (view plot)	1,353,400,000.00

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 97.11261% with 30 lines in your changes missing coverage. Please review.

Project coverage is 99.22%. Comparing base (9a4ee97) to head (012a145).

Files	Patch %	Lines
postgresql_extensions/src/extensions.rs	70.42%	21 Missing :warning:
postgresql_extensions/src/repository/registry.rs	94.49%	6 Missing :warning:
...sql_extensions/src/repository/steampipe/matcher.rs	97.46%	2 Missing :warning:
...gresql_archive/src/repository/github/repository.rs	90.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #110 +/- ## ========================================== - Coverage 99.46% 99.22% -0.25% ========================================== Files 78 92 +14 Lines 8586 9623 +1037 ========================================== + Hits 8540 9548 +1008 - Misses 46 75 +29 ```

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