Add convenience function `load_detector` and `load_all_detector` #248

Job	Run time
Formatting and static analysis	35s
Tests (ubuntu-22.04, 3.10, py310) / test	4m 59s
Tests (ubuntu-22.04, 3.10, py310) / package-test	33s
docs / Build documentation	3m 40s
	9m 47s

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