Convert Attributes and AttributeValue into interfaces#1589

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jkwatson wants to merge 2 commits intoopen-telemetry:masterfrom newrelic-forks:api_interfaces

+1,254-957

Commits on Aug 25, 2020

Make Attributes into an interface
jwatson
committed
Convert Attributes and AttributeValue into interfaces with inner Factory classes to create them.
jwatson
committed