Add GeoJSON as new output format for WMS GetFeatureInfo (3.5)

[lgoltz]

Example configuration:

<wms:GetFeatureInfoFormat>
  <wms:GeoJSON allowOtherCrsThanWGS84="true" allowExportOfGeometries="true" />
  <wms:Format>application/geojson</wms:Format>
 </wms:GetFeatureInfoFormat>

Query Parameters:

• GEOMETRIES=true to export geometries (if allowExportOfGeometries="true")
• INFO_CRS=EPSG:25832 to set the CRS of the geometries in the response (if allowOtherCrsThanWGS84="true")

Fixes #1582

[stephanr]

It looks like a commit of the 3.6 line (jakarta upgrade) was included so that this PR now needs a rebase to only include the GeoJSON changes.