## 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
import json
from typing import Any, Dict, List, Optional, Union, cast
import posthoganalytics
from django.core.cache import cache
from django.db.models import Count, Exists, OuterRef, Prefetch, QuerySet
from django.db.models.signals import post_save
from django.dispatch import receiver
from django.utils.timezone import now
from rest_framework import authentication, request, serializers, viewsets
from rest_framework.decorators import action