Support xs:NMTOKENS built-in type from the XSD tool

[Nuvindu]

Area

None

Description

Currently, when there is a built-in type xs:NMTOKENS in the xsd file, the generated records does not properly handle it.

Compiling source
	aldocano/xsd_to_type:0.1.0
ERROR [modules/ota_hotel_avail_notif_rq/OTA_HotelCommonTypes.bal:(1254:5,1254:13)] unknown type 'NMTOKENS'
ERROR [modules/ota_hotel_avail_notif_rq/OTA_HotelCommonTypes.bal:(1442:5,1442:13)] unknown type 'NMTOKENS'
ERROR [modules/ota_hotel_avail_notif_rq/OTA_HotelCommonTypes.bal:(2890:5,2890:13)] unknown type 'NMTOKENS'
error: compilation contains errors

Steps to Reproduce

Use an xsd file containing <xs:NMTOKENS> built-in type and execute the bal xsd command to generate records.

Version

1.2.0

Environment Details (with versions)

No response

[github-actions]

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      - Reason/EngineeringMistake - The issue occurred due to a mistake made in the past.
      - Reason/Regression - The issue has introduced a regression.
      - Reason/MultipleComponentInteraction - Issue occured due to interactions in multiple components.
      - Reason/Complex - Issue occurred due to complex scenario.
      - Reason/Invalid - Issue is invalid.
      - Reason/Other - None of the above cases.