Multithreading & Caching Optimizations for RefreshIG and ExtractMatBundleOperation

[echicoine-icf]

Applied multithreading to various processes to enhance performance, and implemented some caching optimizations to resolve duplicate processing.

RefreshIG also now persists "tests-" files along with measures when a fhir server url is provided.

ExtratMatBundleOperation's -dir argument can be used against a single folder and all subfolders

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• [x] Tests are created / updated
• [x] Documentation is created / updated

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[echicoine-icf]

Closing this in favor of https://github.com/cqframework/cqf-tooling/pull/486