Handle POST requests for patterns

{
  "type": "object",
  "description": "MesheryPattern represents the patterns that needs to be saved",
  "properties": {
    "created_at": {
      "type": "string",
      "format": "date-time"
    },
    "id": {
      "type": "array",
      "items": {
        "type": "integer",
        "format": "uint8"
      }
    },
    "location": {
      "type": "object",
      "description": "It implements native SQL driver interfaces and hence can\nbe used for SQL json or jsonb types as a drop in replacement\nof golang native maps"
    },
    "name": {
      "type": "string"
    },
    "pattern_file": {
      "type": "string"
    },
    "updated_at": {
      "type": "string",
      "format": "date-time"
    },
    "user_id": {
      "type": "string",
      "description": "Meshery doesn't have the user id fields\nbut the remote provider is allowed to provide one"
    }
  }
}