HTTP stable semantic convention implementation

[trask]

Tracking issue for completing the implementation of HTTP stable semantic conventions:

• Make url.scheme opt in for HTTP client metrics and make server.port required #9784
• Change client.port from recommended to opt-in on HTTP server spans #9786
• Change http.request.body.size and http.response.body.size attributes from recommended to opt-in #9799
• Change network.protocol.name from opt-in to conditionally required #9797