[CMake] FIX parent modules library consistency

[guparan]

Parent modules must always interface the same libraries. e.g. Sofa.Component.dll must always be the same

Thus, if some of its child modules are disabled, parent module will not generate a library.

This PR creates and uses a new macro sofa_add_subdirectory_modules. This macro is meant for parent modules to easily add their child modules and sets a variable with all added targets. If a child module is missing or disabled, a message will be shown (not an error) and the library will not be created.

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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).