Dynamic switching between Brassaia and Irmin

• Introduced in !13054 (merged)
  • Improve the manifest to make sure that context_ops is used #7165
  • Change Shell to Disk: #7162

Debug Irmin

• unknown inode key bug is mitigated by !14231 (merged) but the bug still exists https://gitlab.com/tezos/tezos/-/issues/7157
  • A branch has been created but it needs improvements

Code improvements

• Defunctorise Brassaia (improves readability, debugging, maintainability)
  • Io to Unix: !13748 (merged)
  • Remove metadata: !13944 (merged)
  • Follow #7434 for all remaining defunctorizations
• Renamings
  • Info is not a clear module name: #7151

Infrastructure

• Irmin tests have been added to the CI
  • Irmin tests are using Alcotezt instead of Tezt: #7132
  • Some tests are flaky: #7182
  • Replace the Base58 dependency with Lib_crypto.Base58: #7150
• Have benches to ensure that we don't introduce regressions when we modify the code
  • A MR adds a duo_context option to run Irmin and Brassaia in parallel: !13867 (merged)
    • This MR could be used to create regression checks and benchmarks

Miscellaneous

• Change licenses #7219