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]

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)
extract	➖ (view plot)	152,170.00
lifecycle	➖ (view plot)	904,920,000.00

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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

Additional details and impacted files

@@            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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