Cache the "raw" standard font data in the worker-thread (PR 12726 follow-up)

*This implementation is basically a copy of the pre-existing `builtInCMapCache` implementation.*

For some, badly generated, PDF documents it's possible that we'll end up having to fetch the *same* standard font data over and over (which is obviously inefficient).
While not common, it's certainly possible that a PDF document uses *custom* font names where the actual font then references one of the standard fonts; see e.g. issue 11399 for one such example.

Note that I did suggest adding worker-thread caching of standard font data in PR 12726, however it wasn't deemed necessary at the time. Now that we have a real-world example that benefit from caching, I think that we should simply implement this now.

test/unit/annotation_spec.js

@@ -125,6 +125,7 @@ describe("annotation", function () {
       idFactory: createIdFactory(/* pageIndex = */ 0),
       fontCache: new RefSetCache(),
       builtInCMapCache,
+      standardFontDataCache: new Map(),
     });
   });