Add tests exploring threaded and parallel Python memory usage

[d33bs]

This issue highlights the possibility of exploring how memory consumption works alongside threaded or parallel process management within Python. Ideas here:

• Explore built-in Python multithreading and multiprocess memory usage
• Explore non-built-in Python multithreading and multiprocess memory usage
• Explore this also through multiple memory allocators (i.e. non-built-in capabilities)