feat: apply sliding window rate limiting

[JacobCoffee]

Description

• Attempts to apply rate limiting in a sliding window scenario to only affect noisy traffic

Closes

• Closes HTTP rate limiting #502

[ewdurbin]

Overall this appears to work as expected, a couple notes on more thorough review.

[JacobCoffee]

@ewdurbin any lingering thoughts here or is it ready you think?

[JacobCoffee]

double checking again before merging against a dummy docs host with added in local rate limit and bugs host, seems like it will do the thing™

psf-salt on  rate [🤷✓] via  pyenv via ⍱ v2.4.1 on ☁️  (us-east-2) 
➜ curl -I -s -H "Host: bugs.python.org" --resolve "bugs.python.org:80:192.168.60.19" "http://bugs.python.org/_check"
HTTP/1.1 301 Moved Permanently
content-length: 0
location: https://bugs.python.org/_check


psf-salt on  rate [🤷✓] via  pyenv via ⍱ v2.4.1 on ☁️  (us-east-2) 
➜ curl -I -s -H "Host: bugs.python.org" --resolve "bugs.python.org:80:192.168.60.19" "http://bugs.python.org/_check"
HTTP/1.1 301 Moved Permanently
content-length: 0
location: https://bugs.python.org/_check


psf-salt on  rate [🤷✓] via  pyenv via ⍱ v2.4.1 on ☁️  (us-east-2) 
➜ curl -I -s -H "Host: bugs.python.org" --resolve "bugs.python.org:80:192.168.60.19" "http://bugs.python.org/_check"
HTTP/1.1 429 Too Many Requests
content-length: 117
cache-control: no-cache
content-type: text/html