Fix Memory Leak

* All: [BUG FIX] Corrected the issue that the memory usage increase continuously, if repeating to load/unload AppDomain.
* Hosting: Applied the API changes depended on CppAnonym. Removed the clean-up of Log because it is called more than once.
* Metadata: Applied the API changes depended on CppAnonym.
* Profiling: Applied the API changes depended on CppAnonym. Organize the object factory of ProfilingInfo.