Add support for loading physics engine plugins from static plugin reg… #95

Job	Run time
test / matrix-prep-os	4s
test / matrix-prep-bazelversion	8s
test / test (ubuntu-latest, 7.3.1, ., true)	51m 14s
test / test (ubuntu-latest, 8.0.0, ., true)	50m 32s
	1h 41m 58s

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