add OTEL_PYTHON_HTTP_SERVER_REQUEST_DURATION_SERVER_ATTRIBUTES_ENABLED flag

[zeitlinger]

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Description

add

• OTEL_PYTHON_HTTP_SERVER_REQUEST_DURATION_SERVER_ATTRIBUTES_ENABLED flag to add server.address and server.port for http.server.request.duration - which are opt-in
• OTEL_PYTHON_HTTP_SERVER_ACTIVE_REQUESTS_COUNT_SERVER_ATTRIBUTES_ENABLED - flag to add server.address and server.port for http.server.active_requests - also opt-in

This env var does not exist for any other language so far.

Type of change

• [x] New feature (non-breaking change which adds functionality)
• [x] This change requires a documentation update

How Has This Been Tested?

tests included in this PR

Does This PR Require a Core Repo Change?

• [ ] Yes. - Link to PR:
• [x] No.

Checklist:

See contributing.md for styleguide, changelog guidelines, and more.

• [x] Followed the style guidelines of this project
• [ ] Changelogs have been updated
• [x] Unit tests have been added
• [ ] Documentation has been updated