fix: foreign asset multilocation as hex

[Imod7]

Description

Closes #1599

Changes

• Added Foreign Assets controller to Westend Asset Hub and Westend Asset Hub Next chain config.
• Implemented a fallback when multilocation is given as a hexadecimal value to still return the AssetInfo and Metadata (as empty).
• Added the multiLocation of the foreign asset in the response.
• Updated existing test to include the multiLocation.
• Created a new test that has a hexadecimal value as multiLocation.
• Updated docs.

Testing

When connecting Sidecar to Westend Asset Hub (wss://westend-asset-hub-rpc.polkadot.io) and querying the endpoint http://127.0.0.1:8080/pallets/foreign-assets, the response is now returned with no errors:

{
  "at": {
    "hash": "0x2e75bb2ed5541d6fc754aa75f604bdd9cbe1de1511710e47405a54e9eb38c2e0",
    "height": "11052065"
  },
  "items": [
    {
      "multiLocation": {
        "parents": "2",
        "interior": {
          "X1": [
            {
              "GlobalConsensus": {
                "Ethereum": {
                  "chainId": "11,155,111"
                }
              }
            }
          ]
        }
      },
      "foreignAssetInfo": {
        "owner": "5GjRnmh5o3usSYzVmsxBWzHEpvJyHK4tKNPhjpUR3ASrruBy",
        "issuer": "5GjRnmh5o3usSYzVmsxBWzHEpvJyHK4tKNPhjpUR3ASrruBy",
        "admin": "5GjRnmh5o3usSYzVmsxBWzHEpvJyHK4tKNPhjpUR3ASrruBy",
        "freezer": "5GjRnmh5o3usSYzVmsxBWzHEpvJyHK4tKNPhjpUR3ASrruBy",
        "supply": "0",
        "deposit": "0",
        "minBalance": "15000",
        "isSufficient": true,
        "accounts": "0",
        "sufficients": "0",
        "approvals": "0",
        "status": "Live"
      },
      "foreignAssetMetadata": {
        "deposit": "0",
        "name": "0x",
        "symbol": "0x",
        "decimals": "0",
        "isFrozen": false
      }
    },
    {
      "multiLocation": "0x30e64a56026f4b5e3c2d196283a9a17dd34371a193a751eea5883e9553457b2e6bfbb13fd9927e49c4a09ac55ab47d05020209049edaa8020300fff9976782d46cc05630d1f6ebab18b2324d6b14",
      "foreignAssetInfo": {
        "owner": "5GjRnmh5o3usSYzVmsxBWzHEpvJyHK4tKNPhjpUR3ASrruBy",
        "issuer": "5GjRnmh5o3usSYzVmsxBWzHEpvJyHK4tKNPhjpUR3ASrruBy",
        "admin": "5GjRnmh5o3usSYzVmsxBWzHEpvJyHK4tKNPhjpUR3ASrruBy",
        "freezer": "5GjRnmh5o3usSYzVmsxBWzHEpvJyHK4tKNPhjpUR3ASrruBy",
        "supply": "106000000000000",
        "deposit": "100000000000",
        "minBalance": "1",
        "isSufficient": false,
        "accounts": "2",
        "sufficients": "0",
        "approvals": "0",
        "status": "Live"
      },
      "foreignAssetMetadata": {}
    },
  ...

Note: The second item in this example is the one with multiLocation as a hexadecimal value.

[filvecchiato]

Nice! LGTM!

[TarikGul]

🚀