Provide latest immutable file number with certified ctx

[sfauvel]

Content

This PR add the latest immutable file number in the sign certificate protocol message.

Pre-submit checklist

• Branch
  • Tests are provided (if possible)
  • Crates versions are updated (if relevant)
  • Commit sequence broadly makes sense
  • Key commits have useful messages
• PR
  • No clippy warnings in the CI
  • Self-reviewed the diff
  • Useful pull request description
  • Reviewer requested
• Documentation
  • Update README file (if relevant)
  • Update documentation website (if relevant)
  • Add dev blog post (if relevant)

Issue(s)

Closes #1536

[github-actions]

Test Results

    3 files  ±0     42 suites  ±0   8m 36s ⏱️ -11s
  920 tests +7    920 ✅ +7  0 💤 ±0  0 ❌ ±0 
1 009 runs  +7  1 009 ✅ +7  0 💤 ±0  0 ❌ ±0 

Results for commit 98e7ee5. ± Comparison against base commit 9622126.

This pull request removes 1 and adds 8 tests. Note that renamed tests count towards both.

mithril-common ‑ entities::protocol_message::tests::test_protocol_message_compute_hash

mithril-aggregator ‑ http_server::routes::proof_routes::tests::build_response_message_return_immutable_file_number_from_artifact_beacon
mithril-common ‑ entities::protocol_message::tests::test_protocol_message_compute_hash_include_cardano_transactions_merkle_root
mithril-common ‑ entities::protocol_message::tests::test_protocol_message_compute_hash_include_lastest_immutable_file_number
mithril-common ‑ entities::protocol_message::tests::test_protocol_message_compute_hash_include_next_aggregate_verification_key
mithril-common ‑ entities::protocol_message::tests::test_protocol_message_compute_hash_include_snapshot_digest
mithril-common ‑ entities::protocol_message::tests::test_protocol_message_compute_hash_the_same_hash_with_same_protocol_message
mithril-common ‑ messages::cardano_transactions_proof::tests::verify_hashes_from_verified_cardano_transaction_and_from_signable_builder_are_equals
mithril-common ‑ signable_builder::cardano_transactions::tests::test_compute_signable_with_no_transaction_return_error

♻️ This comment has been updated with latest results.

[jpraynaud]

Looks good overall 👍

The PR is missing the client CLI and WASM parts.
I have also left few comments below.

[jpraynaud]

LGTM 👍