## Bug description

Creating a selector with an attribute isn't working at all.

`[data-attr="bla"]`

## Expected behavior

It should work

## How to reproduce

1. Create action
2. Add an attribute in the selector
3. 


## Additional context

The reason for this is that we store the attributes as `attr__data-attr` but we do not add `attr__` in the filtering. I am working on a solution.


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posthog/models/event.py
import copy
import datetime
import random
import re
import string
from collections import defaultdict
from typing import Any, Dict, List, Optional, Tuple, Union
import celery
from django.conf import settings
from django.contrib.postgres.fields import JSONField
from django.core.cache import cache
from django.db import connection, models, transaction
from django.db.models import (