refactor!: move version from PostgreSQL::new() to Settings

[brianheineman]

This PR makes significant changes to the way the PostgreSQL Version is managed. The version is moved into Settings to provide a consistent configuration approach. This also enables the version to be configured from a URL.

API Changes

• added Settings.version: Version
• changed postgresql_embedded::PostgreSQL::new(Version,Settings) to postgresql_embedded::PostgreSQL::new(Settings)
• removed postgresql_embedded::PostgreSQL.version()
• removed postgresql_embedded::PostgreSQL::default_version()
• changed postgresql_embedded::blocking::PostgreSQL::new(Version,Settings) to postgresql_embedded::blocking::PostgreSQL::new(Settings)
• removed postgresql_embedded::blocking::PostgreSQL.version()

Migration If a specific version was being specified, then the code can generally change from this:

let version = V15;
let settings = Settings::default();
let postgresql = PostgreSQL::new(version, settings);

to this:

let version = V15;
let settings = Settings {
    version,
    ..Settings::default()
};
let postgresql = PostgreSQL::new(settings);

[github-actions[bot]]

Bencher

Report	Fri, June 21, 2024 at 19:46:03 UTC
Project	theseus-rs/postgresql-embedded
Branch	refactor-version
Testbed	localhost

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Benchmark	Latency	Latency Results nanoseconds (ns)
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lifecycle	➖ (view plot)	904,920,000.00

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Codecov Report

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

Project coverage is 99.75%. Comparing base (4055763) to head (589596b).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #82 +/- ## ========================================== - Coverage 99.78% 99.75% -0.03% ========================================== Files 59 59 Lines 7775 7775 ========================================== - Hits 7758 7756 -2 - Misses 17 19 +2 ```

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