Initial PR to add support for stackoverflow teams

[allen-munsch]

This PR does the following:

• Downloads posts which consist of questions and answers
• It adds the version to the requirements.txt
• It adds aiosqlite to, and allows validate_config to await
• It adds a rate_limit utility function, which Locks and appeared to work ( I was kicked off stackoverflow ) several times because they just turn off IP addresses
• Fixes multiple Rendering issues with data-source-panel.tsx

I was super confused by stackoverflows api filtering. Like filter=!nOedRLbqzB means withbody so the post has the body markdown. Need to validate this is correct.

I tried to get the articles too, but ran into 406 errors, and it wasn't helpful. I'd need to

requests.exceptions.HTTPError: 406 Client Error: Not Acceptable for url: https://api.stackoverflowteams.com/2.3/articles?&team=asdfasdf&filter=!nOedRLbqzB&page=1&fromdate=1325397600

In any case, I also added an icon, and reduced the size of it.

# i ran a test python -m data_source.sources.stackoverflow # but messed up the ack queue, cleared it, and it looked like stuff might be working # delete from ack_queue_task where _id in (select _id from ack_queue_task); 

So i also include a clear_ack_queue.sh, and a clear_data_source.sh

🎉 oh hey look at that

[allen-munsch]

i'm not working on this any longer. feel free to reopen/fork. thanks