New `access_level` field for board view queries

You can now retrieve a user's permission level when querying board views using the new access_level field. It returns an enum value that specifies whether the user can view or edit the board.

query {
  boards (ids: 1234567890) {
    views {
      type
      settings_str
      view_specific_data_str
      name
      id
      access_level
    }
  }
}