Implement Artifact routes

[jpraynaud]

Content

This PR includes the implementation of artifact routes for Cardano Immutable Files Full Snapshot and Mithril Stake Distribution signed entity types.

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

Issue(s)

Closes #893

[github-actions]

Test Results

    3 files  ±0    30 suites  ±0   5m 43s ⏱️ -13s
591 tests +7  591 ✔️ +7  0 💤 ±0  0 ❌ ±0 
667 runs  +7  667 ✔️ +7  0 💤 ±0  0 ❌ ±0 

Results for commit 9dd318e. ± Comparison against base commit 54e8cf9.

This pull request removes 11 and adds 18 tests. Note that renamed tests count towards both.

http_server::routes::snapshot_routes::tests ‑ test_snapshot_digest_get_ko
http_server::routes::snapshot_routes::tests ‑ test_snapshot_digest_get_ok
http_server::routes::snapshot_routes::tests ‑ test_snapshot_digest_get_ok_nosnapshot
http_server::routes::snapshot_routes::tests ‑ test_snapshot_download_get_ko
http_server::routes::snapshot_routes::tests ‑ test_snapshot_download_get_ok
http_server::routes::snapshot_routes::tests ‑ test_snapshot_download_get_ok_nosnapshot
http_server::routes::snapshot_routes::tests ‑ test_snapshots_get_ko
http_server::routes::snapshot_routes::tests ‑ test_snapshots_get_ok
message_adapters::to_snasphot_message::tests ‑ adapt_ok
snapshot_stores::local_snapshot_store::tests ‑ can_get_added_snapshot_details
…

http_server::routes::artifact_routes::mithril_stake_distribution::tests ‑ test_mithril_stake_distribution_get_ko
http_server::routes::artifact_routes::mithril_stake_distribution::tests ‑ test_mithril_stake_distribution_get_ok
http_server::routes::artifact_routes::mithril_stake_distribution::tests ‑ test_mithril_stake_distribution_ok_norecord
http_server::routes::artifact_routes::mithril_stake_distribution::tests ‑ test_mithril_stake_distributions_get_ko
http_server::routes::artifact_routes::mithril_stake_distribution::tests ‑ test_mithril_stake_distributions_get_ok
http_server::routes::artifact_routes::snapshot::tests ‑ test_snapshot_digest_get_ko
http_server::routes::artifact_routes::snapshot::tests ‑ test_snapshot_digest_get_ok
http_server::routes::artifact_routes::snapshot::tests ‑ test_snapshot_digest_get_ok_nosnapshot
http_server::routes::artifact_routes::snapshot::tests ‑ test_snapshot_download_get_ko
http_server::routes::artifact_routes::snapshot::tests ‑ test_snapshot_download_get_ok
…

♻️ This comment has been updated with latest results.