core: set sampled for local span per MethodDescriptor. #3627
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This moves away from the global String-based Span name registry which
is not as flexible as we desire.
Also renamed the option name to be more accurate. This is not
API-breaking because the origianl addition to MethodDescriptor and
code-gen didn't make it into the 1.7.0 release.
This is using a snapshot of opencensus, and needs to switch to a
release before merging.