chore(consensus): Add separator before type suffix in integer literals.

[daniel-wong-dfinity-org]

E.g. 42u64 is changed to 42_u64.

Fix stats: ~176 literals across 73 files.

How to re-create these changes:

1. Build the tool. It is not in master yet; rather, it is in review in PR 9418. Until that happens, you'll first need to check out add-integer-type-suffix-separator-tool-daniel-wong. Then, bazel build //rs/tools/add-integer-type-suffix-separator.

2. Then, check out the master commit that this is based on (originally, 40ad82dbd8) and run the tool against all directories owned by the Consensus team.

for DIRECTORY in \
    rs/artifact_pool \
    rs/backup \
    rs/canister_client \
    rs/config \
    rs/consensus \
    rs/crypto \
    rs/cup_explorer \
    rs/http_endpoints \
    rs/http_utils \
    rs/https_outcalls \
    rs/ingress_manager \
    rs/monitoring \
    rs/orchestrator \
    rs/p2p \
    rs/recovery \
    rs/replay \
    rs/replica \
    rs/rust_canisters/proxy_canister \
    rs/test_utilities/artifact_pool \
    rs/test_utilities/consensus \
    rs/test_utilities/in_memory_logger \
    rs/test_utilities/metrics \
    rs/validator \
    rs/types/exhaustive_derive \
    rs/tests/nested/nns_recovery \
    rs/ic_os/metrics/fstrim_tool
do
    ./bazel-bin/rs/tools/add-integer-type-suffix-separator/add-integer-type-suffix-separator $DIRECTORY
done

git restore rs/crypto/tree_hash