Add SpanId class.#10

Merged

g-easy merged 12 commits intoopen-telemetry:masterfrom

Jan 16, 2020

Commits on Dec 19, 2019

Initial sketch of span_id, example, and build.
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Commits on Jan 7, 2020

Merge branch 'master' into bazel
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Commits on Jan 13, 2020

Commits on Jan 16, 2020

Merge remote-tracking branch 'origin/master' into bazel
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