Add HOCON support to MP config profiles

[barchetta]

Environment Details

• Helidon Version: 2.5.0
• Helidon MP

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Problem Description

Currently you must use a custom builder to use HOCON config sources based on Helidon SE APIs. This request is to enhance our MicroProfile Config Profile feature to support HOCON config sources, similar to what we do with YAML (have a HOCON config source and support for MP meta configuration and profiles).

[klustria]

This is currently being tackled in #4218.

[klustria]

As part of this change, meta-config was refactored to become a service provider and in the process can now allow users to create their own custom meta-config. The hocon for mp feature was added as a meta-config service provider so users can have their hocon or json config files as config sources.

[klustria]

Implemented via PR #4218.