Prevent PII leak for http requests

[Swatinem]

I believe this is relevant for the actix and tower-http integrations. We have no integration for outgoing requests so that is the responsibility of the API user.

Copy-pasted: getsentry/sentry-python#1742

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When we do HTTP requests to third party services we create a breadcrumb with the URL and also create a span that has the URL as a description (and also breadcrumbs including this URL are created.)

We created RFC-0038 to decide how to improve the current situation and creating a spec here: getsentry/develop#773

Make sure that all integrations that record outgoing or incoming HTTP request structure the data like described in the spec linked above.