gtkicontheme: Provide safe thread sync load_iconthread-safe-load-icon

Although we have a thread safe async version since 7690846c3f1, the sync
version cannot be run in a different thread than the main one without
explicitly copying the internal data. Having an async version leads to
believe that the sync version would be thread safe.

It would be good to provide that alternative to be able to run this
on custom thread workers, and at the same time avoid the confusion with
the async alternative.

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