Tornado: Capture custom request/response headers as span attributes #950
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Description
This PR implements the HTTP request/response headers as span attributes semantic convention for tornado framework.
Fixes #915
Type of change
How Has This Been Tested?
Added unit tests for the changes. Also, tested by capturing headers manually with tornado and observing the output on jaeger backend.
Does This PR Require a Core Repo Change?
Checklist:
See contributing.md for styleguide, changelog guidelines, and more.