Extract persistence related code to a new shared crate

[Alenar]

Content

This PR create a new shared crate, mithril-persistence. All all store & database related code from mithril-common has been moved to it.

This makes enhance our code base maintainability, reduce the dependencies of the mithril-common crate, allow to remove its database feature.

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 #1492.

[github-actions]

Test Results

  3 files  ±0   37 suites  +1   9m 8s ⏱️ +34s
828 tests ±0  828 ✅ ±0  0 💤 ±0  0 ❌ ±0 
913 runs  ±0  913 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 535ba5a. ± Comparison against base commit f31f1ec.

♻️ This comment has been updated with latest results.

[jpraynaud]

LGTM 👍

I left few comments for typos below. Also, should we bump the minor version of mithril-common as we changed the available features in the crate?

[Alenar]

Also, should we bump the minor version of mithril-common as we changed the available features in the crate?

Yup, bumping the minor version of mithril-common was on my mind .