feat: highlight multiple features with same string id (DHIS2-11969) #447
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This PR allows multiple features with the same id to be highlighted (hover state). It will be used for the upcoming "catchment area" support when the same org unit can be represented by two geometries (point and polygon).
Partly fixes: https://jira.dhis2.org/browse/DHIS2-11969
This change is backwards compatible with the Maps app, which still calls the "highlight" method with the org unit id for the layer in use.
Screen recording showing how both a point and a polygon will be highlighted:
![ezgif com-gif-maker](https://user-images.githubusercontent.com/548708/155293198-5875a4b4-63c3-4929-9716-cf99b383cfbb.gif)