Make arcana a PUBLIC dependency of AppRuntime

AppRuntime.h includes arcana/threading/cancellation.h and
arcana/threading/dispatcher.h in its public header. Consumers need
arcana's include directories to compile. Changed from PRIVATE to PUBLIC.

This was broken by #149 which moved arcana includes into the public
header when merging WorkQueue into AppRuntime.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: bghgary

Core/AppRuntime/CMakeLists.txt

@@ -19,7 +19,7 @@ target_include_directories(AppRuntime
     INTERFACE "Include")
 
 target_link_libraries(AppRuntime
-    PRIVATE arcana
+    PUBLIC arcana
     PUBLIC JsRuntime)
 
 if(NAPI_JAVASCRIPT_ENGINE STREQUAL "V8" AND JSRUNTIMEHOST_CORE_APPRUNTIME_V8_INSPECTOR)