[FEATURE] Introduce new setting, icon by value in document layer

[VijayanB]

Is your feature request related to a problem?

As dashboards-maps user, i should be able to style my geospatial field values as different icons based on contents of my field.

What solution would you like?

Add support to use data driven styling in displaying geospatial field as icons in document layer.

What alternatives have you considered?

Create multiple layers with filters for every field value. This will not be efficient if new values are added or for high cardinality fields.

Do you have any additional context?

N/A