Add support for parameter roles in featureType filter and groupRoles for events

[Phocacius]

Can be used to managed the access to digitizer entries based on mapbender groups.

In the filter query you can use the additional parameter :roles, which is prefilled with all the currently logged-in users groups (including ROLE_USER when the user is logged in).

In an event, you can use the additional variable $groupRoles (in addition to $userRoles) which contains only the roles starting with ROLE_GROUP, excluding e.g. ROLE_USER.

Example configuration (assuming in the digitizer table there's a column mapbender_group):

groupfilteredtable:
  label: Group filtered table
  maxResults: 500
  featureType:
    connection: geodb
    table: geotable
    uniqueId: gid
    geomType: point
    geomField: geom
    srid: 25832
    filter: 'mapbender_group in (:roles)'
    events:
      onBeforeSave: "$feature->setAttribute('mapbender_group', implode(', ', $groupRoles));"