Move pysmurf-controller functions that load lots of data to subprocess (

#669)

* Moves functions that load lots of data to subprocess

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* bugfixess and changed subprocess func so it only should be run in worker thread

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* Unused imports

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* Fix unit-tests by adding ability to run smurf funcs in main process if specified.

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* Address Brian's feedback

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>