feat(nervous-system): Add crate candid-utils and add proper Candid service argument validation #3488
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This PR adds a new crate dedicated to Candid utilities that are likely to be useful in multiple places in the mono repo.
First, we add
candid_utils::validation::validate_upgrade_args, which takes a full Candid service and checks if a given upgrade argument complies with it, using Candid subtyping. In particular, this function will soon be required in a tool for submitting upgrade proposals for SNS-controlled canisters.| Next PR >