Team Avatar Listings API Route

**Is your feature request related to a problem? Please describe.**
We would like to have a new route on the API that will respond with the team's avatar.
The image format can be base64 or any other format you can support.


**Describe the solution you'd like**
I think there should be some way to get the avatars in a couple of ways:

- By individual team
- By Region
- By Event

**Describe alternatives you've considered**
I tried to see if I could use the same method as the FTC-events website, but I found a huge CSS file with a class declaration for each team. Also, this CSS file is being fetched using some pre-signed URL and it might not be the best idea to deal with that :-)

**Additional context**
[Team Avatar Listings - FRC API](https://frc-api-docs.firstinspires.org/#1ca9c544-9112-4a28-b654-aec7933bb9c0)