Add support for loading physics engine plugins from static plugin registry #92

Job	Run time
test / matrix-prep-bazelversion	6s
test / matrix-prep-os	2s
test / test (ubuntu-latest, 8.0.0, ., true)	51m 3s
test / test (ubuntu-latest, 7.3.1, ., true)	51m 2s
	1h 42m 13s

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