ConfigApi.getLayerConfig

[ychoquet]

Description

PR related to the implementation of the getLayerConfig method of the ConfigApi.

The implementation only covers the default values for the GeoView layers and the returned vallues for the GeoCore layers. A new section must be added to the config-sandbox to test the code and display the result. Fixes #2205

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

How Has This Been Tested?

Using Chrome Devtool to trace and debug the code.

Deploy URL: https://ychoquet.github.io/GeoView/config-sandbox.html

Checklist:

• [x] I have build (rush build) and deploy (rush host) my PR
• [x] I have connected the issues(s) to this PR
• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] My changes generate no new warnings
• [ ] I have created new issue(s) related to the outcome of this PR is needed
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

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This change is