FEAT: Add new known addresses file argument to init

[GiovanniTorrisi-ChainSecurity]

From: #92

Add a new argument to the init command to load known addresses from a JSON file with the following structure (1 is the chainID):

{
  "1": {
    "0xf949982b91c8c61e952b3ba942cbbfaef5386684": {
        "name": "CollateralRegistry",
        "address_type": "Contract"
    }
  }   
}

Such known addresses are then stored in the registry and are used to decode addresses and make it easier to verify deployment.