feat!: add `MultiplyExpr` (#18) #9

Job	Run time
lint-and-test / Format	13s
lint-and-test / Test Suite	9m 0s
lint-and-test / Check Package	2m 1s
lint-and-test / Clippy	2m 2s
lint-and-test / Unused Dependencies	6m 36s
Release	40s
	20m 32s

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