Add VocaDB songs API lyrics integration

[shikendon]

API document: https://vocadb.net/swagger/ui/index

GET /api/songs

{
  "items": [
    {
      "lyrics": [
        {
          "cultureCode": "string",
          "id": 0,
          "source": "string",
          "translationType": "Original",
          "url": "string",
          "value": "string"
        }
      ]
    }
  ]
}