Add key predicate to baggage span processor #2535
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Description
Updates the Baggage span processor to require a baggage key predicate function that selects what keys are copied to new spans.
Fixes #2472
Type of change
Please delete options that are not relevant.
(The original span processor PR Request for new component: Baggage Span Processor #2428 has been published yet so this is not breaking)
How Has This Been Tested?
Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration
Does This PR Require a Core Repo Change?
Checklist:
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