[framework] Add external_object module for support of offchain objects #73135

Job	Run time
file_change_determinator	11s
rust-doc-tests	0s
rust-unit-tests	0s
rust-consensus-only-smoke-test	0s
rust-consensus-only-unit-test	0s
rust-cargo-deny	1m 50s
rust-lints	3m 44s
general-lints	30s
rust-check-merge-base	1m 26s
rust-cryptohasher-domain-separation-check	0s
rust-smoke-tests	0s
rust-targeted-unit-tests	11m 56s
rust-build-cached-packages	0s
	19m 37s

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