refactor: Take `impl BlockStore` instead of `&impl BlockStore` in gen… #74

Job	Run time
run-cargo-tests (stable)	1m 48s
run-headless-tests (ubuntu-latest, firefox)	41s
run-cargo-tests (nightly)	1m 49s
run-checks (stable)	2m 41s
run-headless-tests (ubuntu-latest, chrome)	43s
run-checks (nightly)	1m 49s
run-checks (1.75)	1m 51s
	11m 22s

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