Use zstandard compression for snapshot archives

[Alenar]

Content

This PR add the Zstandard compression algorithm as an option for archive creation.

In order to do so a field named compression_algorithm is added to the Snapshot entity and message. For the message this field is optional and will default to the previous algorithm, Gunzip, if missing.

Furthermore Zstandard algorithm can be configured in the aggregator configuration: we can set the compression level (default to 9) and the number of worker (default to 4, using 0 will disable multi-threading).

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)

Comments

Note: the snapshotter::verify_archive function add to be updated to allow concurrent execution. Before it always used the same folder to work, now the folder name is appended with the archive name.

Issue(s)

Closes #876

[github-actions]

Test Results

    3 files  ±0    17 suites  ±0   5m 2s ⏱️ -13s
673 tests +2  673 ✔️ +2  0 💤 ±0  0 ❌ ±0 
729 runs  +2  729 ✔️ +2  0 💤 ±0  0 ❌ ±0 

Results for commit 445d76d. ± Comparison against base commit a6caa1c.

♻️ This comment has been updated with latest results.

[jpraynaud]

LGTM 👍

Just need to make the few adjustments we discussed!