Add support for loading physics engine plugins from static plugin registry #91

Job	Run time
test / matrix-prep-os	3s
test / matrix-prep-bazelversion	5s
test / test (ubuntu-latest, 7.3.1, ., true)	3m 2s
test / test (ubuntu-latest, 8.0.0, ., true)	3m 3s
	6m 13s

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