test

feat: reintroduce backend.inspect #2310

Job	Run time
CI install anvil-zksync	6s
codespell	11s
clippy	2m 1s
CI install	11s
crate-checks	3m 59s
doctest	1m 50s
forge-fmt	1m 45s
rustfmt	18s
zk-cargo-test	2m 52s
nextest / build matrices	4s
nextest / test unit	3m 18s
nextest / test integration (1/3)	3m 42s
nextest / test integration (2/3)	3m 42s
nextest / test integration (3/3)	3m 43s
nextest / test integration / issue-repros (1/2)	3m 42s
nextest / test integration / issue-repros (2/2)	3m 42s
nextest / test integration / external (1/2)	3m 42s
nextest / test integration / external (2/2)	3m 43s
	42m 31s

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