## Is your feature request related to a problem?

When trying to create a filter for a query, value autocompletes are case sensitive. This throws up weird behaviors. 

E.g, with the country name filter entering 'f' as the first letter autocompletes to 'Africa' (and, for some reason, the Isle of Man) and 'France is not listed as an option. Entering 'F' autocompletes to France. 

## Describe the solution you'd like

Not case sensitive results, or else better filtering. Africa shouldn't come up if I only enter 'f'. 

## Describe alternatives you've considered



## Additional context


<img width="886" alt="Screenshot 2022-01-12 at 13 40 00" src="https://user-images.githubusercontent.com/84011561/149151022-6648bc51-c0ff-4116-8611-cb64e88e9483.png">

<img width="887" alt="Screenshot 2022-01-12 at 13 40 11" src="https://user-images.githubusercontent.com/84011561/149151048-86098606-551b-4757-b133-f80b739c4974.png">


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

posthog/api/test/test_event.py
import json
import uuid
from datetime import datetime
from typing import Union
from unittest.mock import patch
from urllib.parse import unquote, urlencode
import pytz
from dateutil import parser
from dateutil.relativedelta import relativedelta
from django.conf import settings
from django.utils import timezone
from freezegun import freeze_time
from rest_framework import status
from posthog.constants import AnalyticsDBMS
from posthog.models import (
    Action,
    ActionStep,
    Element,
    Event,
    Organization,
    Person,
    Team,
    User,
)
from posthog.models.cohort import Cohort
from posthog.test.base import APIBaseTest
def factory_test_event_api(event_factory, person_factory, _):
    class TestEvents(APIBaseTest):