feat(logging): gunicorn extra parsing

[JacobCoffee]

Split off from https://github.com/pypi/warehouse/pull/18748

opensearch-1                    | [2025-09-24T21:32:40,462][INFO ][o.o.j.s.JobSweeper       ] [356b8f0e5f55] Running full sweep
db-1                            | 2025-09-24 21:32:42.281 UTC [27] LOG:  checkpoint starting: time
web-1                           | 2025-09-24T21:32:48.907827Z [info     ] http_request                   [gunicorn.access] dd.env=development dd.version=unknown method=GET path=/ protocol=HTTP/1.1 referrer=None remote_addr=192.168.147.1 request='GET / HTTP/1.1' size=24337 status=200 time='24/Sep/2025:21:32:48 +0000' user=None user_agent=curl/8.7.1

Adds strucutre to gunicorn logging buty also dev renderer for easier-on-the-eyes viewing in terminal locally (dev only)

pairs with https://github.com/pypi/warehouse/pull/18843