feat: Add for_each_section to MultiConfig

[steverough]

SDB-9727

[gemini-code-assist]

Summary of Changes

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This pull request enhances the MultiConfig utility by introducing a new iteration capability, making it easier to process and access individual configuration sections. This improves the flexibility and usability of the configuration management component.

Highlights

• New for_each_section method: A templated for_each_section method has been added to the MultiConfig class, allowing users to iterate over its named sections. This method provides access to both the section name (key) and the Config object (value) for each section, leveraging std::for_each internally.

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[gemini-code-assist]

Code Review

This pull request introduces a for_each_section method to the MultiConfig class, which is a useful addition for iterating over configuration sections. My review includes a suggestion to modernize the implementation using a range-based for loop, which would improve readability. More importantly, the new functionality is not covered by unit tests. I've added a comment highlighting the need to add tests to ensure the feature is robust and maintainable.