Falcon: Capture request/response headers as span attributes #1003
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Description
This PR implements the HTTP request/response headers as span attributes semantic convention for falcon framework.
Added check to add custom headers in Recording Span to avoid bug #956 #998 that came in previous PRs.
Fixes #912
Type of change
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How Has This Been Tested?
Added unit tests for the changes. Also, tested by capturing headers manually with instrumented falcon app 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.