Adapt to the new account storage format

[sideninja]

There's a new account storage format and the Playground FE needs to implement the changes. The new format contains three new top-level items called: Storage, Public, Private representing different storage locations. The storage inspection must adapt to these new values.

An example of new storage JSON response format is:

{
   "Private":null,
   "Public":{
      "flowTokenBalance":{
         "TargetPath":{
            "Domain":"storage",
            "Identifier":"flowTokenVault"
         },
         "BorrowType":"\\u0026A.0000000000000003.FlowToken.Vault{A.0000000000000002.FungibleToken.Balance}"
      },
      "flowTokenReceiver":{
         "TargetPath":{
            "Domain":"storage",
            "Identifier":"flowTokenVault"
         },
         "BorrowType":"\\u0026A.0000000000000003.FlowToken.Vault{A.0000000000000002.FungibleToken.Receiver}"
      }
   },
   "Storage":{
      "flowTokenVault":{
         "ResourceType":{
            "Location":{
               "Type":"AddressLocation",
               "Address":"0x0000000000000003",
               "Name":"FlowToken"
            },
            "QualifiedIdentifier":"FlowToken.Vault",
            "Fields":[
               {
                  "Identifier":"uuid",
                  "Type":{
                     
                  }
               },
               {
                  "Identifier":"balance",
                  "Type":{
                     
                  }
               }
            ],
            "Initializers":null
         },
         "Fields":[
            25,
            0
         ]
      }
   }
}