Optimize load time and memory consumption by reusing element descriptions #203

Job	Run time
test / matrix-prep-os	19s
test / matrix-prep-bazelversion	4s
test / test (ubuntu-latest, 8.0.0rc1, ., true)	3m 44s
test / test (ubuntu-latest, 7.3.1, ., true)	3m 37s
	7m 44s

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