Function per_resource_digests 

pub fn per_resource_digests(
    node_identity: &str,
    provider: &str,
    resources: &BTreeMap<ResourceId, MmioResource>,
    ceiling: &BTreeMap<ResourceId, ResourceCeiling>,
) -> BTreeMap<ResourceId, Sha256Digest>

The per-resource digests of one proxy instance, in ascending resource ID order (the order combined_digest expects).