Add support for loading System plugin from static plugin registry #10

Job	Run time
test / matrix-prep-os	4s
test / matrix-prep-bazelversion	6s
test / test (ubuntu-latest, 7.3.1, ., true)	16m 26s
test / test (ubuntu-latest, 8.0.0, ., true)	16m 24s
	33m 0s

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