Support Select Layer for WMS Preview

[t83714]

Support Select Layer for WMS Preview

We should support render select lay from WMS service. see here:

https://github.com/magda-io/magda-preview-map/blob/f93606d705269e4652cbae5b53ff575bb7f798d9/lib/Models/MagdaCatalogItem.js#L494

Required changes for this terria map instance are:

• Add optional layerName property on MagdaCatalogItem
• When layerName presents, return WMS item match the layerName.
• Otherwise, will return the first layer as it current does

Please note: by default, terriajs v7 set layerName to WMS item's layers field: https://github.com/TerriaJS/terriajs/blob/7569485af9d965c999a2a512ddd02e2f722f3687/lib/Models/WebMapServiceCatalogGroup.js#L371

Sample

• WMS with one layer:
  • http://www.environment.gov.au/mapping/services/ogc_services/World_Heritage_Areas_label/MapServer/WMSServer?service=WMS&version=1.3.0&request=GetCapabilities
• WMS with more than one layers:
  • http://geofabric.bom.gov.au/simplefeatures/ows?service=WMS&request=GetCapabilities
  • https://data.nsw.gov.au/search/dataset/ds-nsw-ckan-49c1ceee-d98a-455f-99bd-48ad2658796b/details

[t83714]

[t83714]

FeatureType selection:

[t83714]

closed via PR: https://github.com/magda-io/magda-preview-map/pull/13