## Is your feature request related to a problem?

I want to be able to download a CSV of users when I click on a datapoint in a graph

## Describe the solution you'd like

![image](https://user-images.githubusercontent.com/1727427/114418453-cd8d3700-9bb2-11eb-906d-8aa424f48500.png)

When I click on a datapoint I'd like to be able to download a CSV as well as create a cohort from it.

## Describe alternatives you've considered



## Additional context



#### *Thank you* for your feature request – we love each and every one!

posthog/api/action.py
team = self.team
        properties = request.GET.get("properties", "{}")
        data = {"properties": json.loads(properties)}
        start_entity_data = request.GET.get("start_entity", None)
        if start_entity_data:
            entity_data = json.loads(start_entity_data)
            data.update({"entites": [Entity({"id": entity_data["id"], "type": entity_data["type"]})]})
        data.update({"date_from": "-11d"})
        filter = RetentionFilter(data=data)
        result = retention.Retention().run(filter, team)
        return Response({"data": result})
    @action(methods=["GET"], detail=False)
    def funnel(self, request: request.Request, *args: Any, **kwargs: Any) -> Response: