Move SDC sdc.module functions to Core namespace

I uploaded a proposal in https://git.drupalcode.org/issue/drupal-3352256/-/merge_requests/16

In order to remove the sdc_library_info_build I had to make core/ the owner of the libraries. This simplifies the way we compute the paths from the library owner to the asset location. However there was no ideal place to compute the component libraries. I settled with core/lib/Drupal/Core/Asset/LibraryDiscoveryParser.php as it already contained special casing for the 'core' extension. Please advice if there is a better solution.

I added some commentary to the feature MR https://git.drupalcode.org/issue/drupal-3352256/-/merge_requests/16

This may be one of those tickets it would be easier to see the goal when all steps are complete.

For the removal of the help hook though, can a follow up be to add a help_topic file to maybe help or system modules?

Thanks for the review @smustgrave! I am holding the merge until @plopesc confirms my responses satisfy his questions in the MR. I don't want to wait too much though, now that we have momentum on this!

Applied some improvements suggested by Pablo.

Merged after getting slack approval from @plopesc.

@smustgrave I looked into moving hook help into a topic, but I couldn't find a good example of where to put it. AFAICT None other framework component / features have help topics. I think the online documentation is enough. The hook_help wasn't all that useful, to be honest, it was a requirement to pass the module generic test (which is removed now).

Automatically closed - issue fixed for 2 weeks with no activity.