refactor: VertxHttpClientBuilder is public

[manusa]

Description

refactor: VertxHttpClientBuilder is public

Make VertxHttpClientBuilder a top-level class to be able to create a Quarkus-specific HttpClient.Factory and reuse it.

Relates to quarkusio/quarkus#30480

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change
• Chore (non-breaking change which doesn't affect codebase;
  test, version modification, documentation, etc.)

Checklist

• Code contributed by me aligns with current project license: Apache 2.0
• I Added CHANGELOG entry regarding this change
• I have implemented unit tests to cover my changes
• I have added/updated the javadocs and other documentation accordingly
• No new bugs, code smells, etc. in SonarCloud report
• I tested my code in Kubernetes
• I tested my code in OpenShift

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
3 Code Smells

81.5% Coverage
0.0% Duplication

[manusa]

Hi @shawkins,
I need this to be able to create a Quarkus-specific HttpClient.Factory where I can pass its Vertx object. These changes allow me to reuse the builder and the client implementation.
There's nothing fancy here, just moving the affected classes top level and making the builder constructor public.

[shawkins]

LGTM