feat(medcat): Allow loading with fewer addons #1046

Job	Run time
migrate-and-advanved (./notebooks/advanced/*.ipynb)	1m 59s
migrate-and-advanved (./notebooks/introductory/migration/*.ipynb)	2m 9s
migrate-and-advanved (./notebooks/introductory/relcat/*.ipynb)	32m 44s
basic-and-meta	2m 46s
	39m 38s

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