chore(boundary): `salt_sharing` canister implementation #24919

Job	Run time
Bazel Test All	8m 58s
Bazel Build All Config Check	0s
Bazel Build Fuzzers	1m 16s
Bazel Build Fuzzers AFL	1m 40s
Bazel Test macOS Intel	0s
Build IC	20m 26s
Python CI Tests	1m 46s
Cargo Build Release Linux	8m 3s
Cargo Clippy Linux	3m 50s
Build Determinism (//publish/binaries:upload, release, build-ic/release, false)	15s
Build Determinism (//publish/canisters:upload, canisters, build-ic/canisters, false)	13s
Build Determinism (//ic-os/guestos/envs/prod:upload_disk-img, guest-os/update-img, build-ic/icos/...	14s
Build Determinism (//ic-os/hostos/envs/prod:upload_update-img, host-os/update-img, build-ic/icos/...	17s
Build Determinism (//ic-os/setupos/envs/prod:upload_disk-img, setup-os/disk-img, build-ic/icos/se...	16s
	47m 14s

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