[core] Use weak annotation manager

Map and renderer / orchestrator should be able to run on a separate threads,
however, legacy AnnotationManager is shared between Map and Renderer, therefore
is not a thread safe. Until AnnotationManager is deprecated and removed from a
code-base, use it only via weak pointers.

test/tile/tile_cache.test.cpp

@@ -39,7 +39,7 @@ public:
                                   transformState,
                                   fileSource,
                                   MapMode::Continuous,
-                                  annotationManager,
+                                  annotationManager.makeWeakPtr(),
                                   imageManager,
                                   glyphManager,
                                   0};