Stabilize Cardano DB v2 client CLI/library - Phase 1

[jpraynaud]

Why

We want to make the Cardano DB v2 certification stable and provide seamless forward/backward compatibility for users.

What

Use the the two backends (v1 and v2) in the cardano-db command (and cardano_database() in library).

How

• Mithril client CLI:
  • Calibrate max_parallel_downloads in DownloadUnpackOptions for optimal download time on mainnet
  • Add an option for the Cardano database backend in the client CLI (by default use v1 and have an extra option --v2 or --backend=v2):
    • download command
    • list command
    • show command
  • Add all options of v2 in the command:
    • --start, --end and --allow-override for immutable range
    • Add an information for backend compatibility in the doc comments of the parameters
    • Ignore them in v1, and print a warning message stating they are not used
  • Deprecate cardano-db-v2 command:
    • Print a warning message to use the --v2 backend in the cardano-db command
  • Update documentation:
    • Mithril client node commands
    • Upgrade the guide for bootstrapping a Cardano node with restoration of a range of immutables
  • Run manual successful restoration of Cardano database + restart of the Cardano node:
    • Cardano DB v1
      • with ancillary
      • without ancillary
    • Cardano DB v2
      • with ancillary
      • without ancillary
• Mithril client library:
  • Make the cardano_database_v2 function stable
• Update the commands in the Mithril Client multi-platform test workflow in the CI
• Add dev blog post to explain the transition
• Make Discord announcement