[script-composer] Add infer functionality, fix multiple return values #71198

Job	Run time
rust-consensus-only-smoke-test	0s
file_change_determinator	9s
rust-consensus-only-unit-test	0s
rust-doc-tests	0s
rust-unit-tests	0s
rust-cargo-deny	1m 43s
rust-build-cached-packages	0s
general-lints	27s
rust-check-merge-base	1m 27s
rust-cryptohasher-domain-separation-check	0s
rust-lints	4m 19s
rust-smoke-tests	0s
rust-targeted-unit-tests	4m 36s
	12m 41s

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