Use SmallRyeConfigBuilder Customizer to generate Quarkus configuration

[radcortez]

These are significant changes, with the following goals:

• Simplify the generation of Config, by adding a Customizer and removing all individual components registration in the generator
• Register components directly and avoid ServiceLoader
• Merge Quarkus defaults source into SmallRye Config built-in defaults

Used config-quickstart to measure improvements with Java 17 Temurin and Graal 22.3 - Java 17:

	JVM RSS	Native RSS	JVM Start	Native Start
3.4.0	153403	25714	0.624	0.025
#35322	146538	22543	0.597	0.017
Diff to 3.4.0	-4.68%	-14.06%	-4.57%	-46.09%

Overall, this PR, should show startup time and RSS improvements for every Quarkus application (at scale), since the improvements affect the core, which always executes regardless of which extensions are available.

• Fixes Allow to create runtime only ConfigSource #25999
• Fixes Extension config for both build and run time with same prefix #32674

[franz1981]

Quickly taken a look, great Roberto!

[gastaldi]

@radcortez it seems you're using a Mac, which does not provide a case sensitive volume by default. See the discussion in Zulip and #36180 (comment)

[radcortez]

@radcortez it seems you're using a Mac, which does not provide a case sensitive volume by default. See the discussion in Zulip and #36180 (comment)

When I did a rebase, I noticed that file, but I thought it was just code-style formatting applied by the build.

[quarkus-bot]

✔️ The latest workflow run for the pull request has completed successfully.

It should be safe to merge provided you have a look at the other checks in the summary.

[gsmet]

I can see how we wouldn't want a default for an Optional but do you confirm this doesn't change our behavior?

[radcortez]

Yes, it is fine because the profile was always being overridden by the launch mode:
https://github.com/quarkusio/quarkus/pull/35322/files#diff-11168005e2c503c75c2ff0f927c06e4ca8fb9676b91d58e37ea98b05d68cc27dR29

So, there's no point in setting it here. Also, it would show up as the default in the docs, and because the profile changes depending on the launch mode, it doesn't make sense either to show a default profile in there.

[gsmet]

Thanks for confirming! Let's get this in then.