## 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
id = serializers.CharField(read_only=False, required=False)
    class Meta:
        model = ActionStep
        fields = [
            "id",
            "event",
            "tag_name",
            "text",
            "href",
            "selector",
            "url",
            "name",
            "url_matching",
            "properties",
        ]
        extra_kwargs = {
            "event": {"trim_whitespace": False},
            "tag_name": {"trim_whitespace": False},
            "text": {"trim_whitespace": False},
            "href": {"trim_whitespace": False},
            "name": {"trim_whitespace": False},
        }
class ActionSerializer(serializers.HyperlinkedModelSerializer):