Prototype of removing bare span attribute keys#1097

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jkwatson wants to merge 3 commits intoopen-telemetry:masterfrom

newrelic-forks:remove_bare_attribute_keys

Commits on Apr 9, 2020

Prototype of making applying semantic attributes a little more type-safe.
jwatson
committed
remove the bare keys, aside from the AttributeValue version
jwatson
committed
a little cleanup
jwatson
committed