add url-parameter cql-filter to geonode mapstore for filtering feature attributes by url

[ffischer1984]

if you have web-applications which consume data in form of embbed_urls this is extremely helpful. This changes enables the geonode to filter feature attributes by url. Here are some examples:

• http://localhost/catalogue/#/dataset/1?cql_filter=fid=1
• http://localhost/namespace:layer/embed?cql_filter=fid=1

further documentation how cql-filters work:

• https://docs.geoserver.org/latest/en/user/extensions/kml/features/filters.html
• https://geoserver.org/tutorials/2024/11/11/geospatial-techno.html
• https://docs.geoserver.org/2.27.x/en/user/tutorials/cql/cql_tutorial.html

It's so extremely useful for sub-applications which consumes data of geonode I don't know why this isn't in the main-branch of geonode. In case of any security-/performance-concerns please let us know and I'll reconsider this.

CLOSE #609

[giohappy]

Hi @ffischer1984, thanks for the proposal. It makes sense, but the implementation should probably be delegated to the Geonode client, rather than an overridden config inside the project.