[Config] Introduce CMake function to treat compilation warnings as errors

[alxbilger]

Treating compilation warnings as errors is a good practice. However, SOFA has so many warnings that we cannot simply turn on this feature for the whole code base. Instead, I suggest to progressively add this feature for individual modules, and privately. For that, I introduced a CMake function.

I activated this feature for Sofa.Config and Sofa.Type. I expect new compilation errors that we will need to fix, before merging this PR.

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Reviewers will merge this pull-request only if

• it builds with SUCCESS for all platforms on the CI.
• it does not generate new warnings.
• it does not generate new unit test failures.
• it does not generate new scene test failures.
• it does not break API compatibility.
• it is more than 1 week old (or has fast-merge label).