Sanitize URLs in Span description and breadcrumbs

[antonpirker]

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.