NetSuite::Records::Department doesn't have to_record

[srchulo]

NetSuite::Records::Department doesn't inherit from NetSuite::Support::Records. Because of this, it does not inherit to_record, and fails to be converted to a record when used in search:

      {
        field: 'department',
        operator: 'anyOf',
        type: 'SearchMultiSelectField',
        value: [
          NetSuite::Records::Department.new(:internal_id => 1)
        ]
      },

Which gets turned into this in a search:

<platformCore:searchValue>#&lt;NetSuite::Records::Department:0x0000562c6a851730&gt;</platformCore:searchValue>

[iloveitaly]

@srchulo good catch! Want to submit a PR adding this in?