Add Cardano start Docker command in the snapshot converter command of client CLI

[jpraynaud]

Why

We want to add an explanation on how to start the Cardano node with the LMDB UTxO-HD backend when converted by the snapshot converter command of the client CLI.

What

Add a Docker command to start the Cardano node with the correct UTxO-HD configuration.

How

• Add a Docker command to start the Cardano node with the correct UTxO-HD configuration
  • Display the command without CARDANO_CONFIG_JSON_MERGE and with a warning message for the Legacy flavor. Use latest compatible version of Cardano (10.3.1)
  • Do not add CARDANO_CONFIG_JSON_MERGE to the command for InMemory flavor. Use latest Cardano version
  • Add a -e CARDANO_CONFIG_JSON_MERGE='{"LedgerDB": { "Backend": "V1LMDB" }}' in the command for LMDB flavor. Use latest Cardano version
  • Prepare support for upcoming flavors (LSMTrees, ...)