refactor: Take `impl BlockStore` instead of `&impl BlockStore` in general #69

Job	Run time
run-checks (stable)	2m 27s
run-headless-tests (ubuntu-latest, firefox)	24s
run-cargo-tests (stable)	1m 44s
run-checks (nightly)	1m 48s
run-headless-tests (ubuntu-latest, chrome)	28s
run-cargo-tests (nightly)	1m 51s
run-checks (1.75)	37s
	9m 19s

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