feat: introduce "avatar" query

[boscohyun]

• Replace some Lib9c.GraphQL types to Mimir.
• Refactor PlanetNameEnumType.
• Remove "inventory" query.
• Introduce "avatar" query with "inventory" inside.

Example

query (
    $planetName: PlanetName! = ODIN,
    $avatarAddress: Address! = "4D5E42553f35c711f4f07757cf73A97a2F69E69c") {
    avatar(planetName: $planetName, address: $avatarAddress)
    {
        agentAddress
        name
        level
        actionPoint
        inventory
        {
            consumables
            {
                itemSheetId
                nonFungibleId
            }
            costumes
            {
                itemSheetId
                nonFungibleId
            }
            equipments
            {
                itemSheetId
                grade
                itemType
                itemSubType
                elementalType
                nonFungibleId
            }
            materials
            {
                itemSheetId
                count
            }
        }
    }
}

{
  "data": {
    "avatar": {
      "agentAddress": "0xCEB5910a777394a809516D34fEc6f964461413EF",
      "name": "Vall7777",
      "level": 266,
      "actionPoint": 0,
      "inventory": {
        "consumables": [
          {
            "itemSheetId": 900109,
            "nonFungibleId": "e814cf3c-c3c5-41ed-ae1f-29e12163cac7"
          },
          {
            "itemSheetId": 900109,
            "nonFungibleId": "f6468bf3-628f-40d3-ac7b-02a9568db23c"
          },
          ...
        ],
        "costumes": [
          {
            "itemSheetId": 40100015,
            "nonFungibleId": "650786db-550f-4145-b1e7-04d760018db9"
          }
        ],
        "equipments": [
          {
            "itemSheetId": 10144000,
            "grade": 4,
            "itemType": "EQUIPMENT",
            "itemSubType": "WEAPON",
            "elementalType": "WIND",
            "nonFungibleId": "aa5c71d1-372a-490d-834a-05c750fe483c"
          },
          {
            "itemSheetId": 10241000,
            "grade": 4,
            "itemType": "EQUIPMENT",
            "itemSubType": "ARMOR",
            "elementalType": "FIRE",
            "nonFungibleId": "d54ee99a-4356-480b-90e9-cf75be4f536d"
          },
          ...
        ],
        "materials": [
          {
            "itemSheetId": 302011,
            "count": 617
          },
          {
            "itemSheetId": 700702,
            "count": 67
          },
          ...
        ]
      }
    }
  }
}

[Atralupus]

LGTM