Commits on Mar 28, 2019

1. Add support for StrictSpans mode in Tracing …

   Goal: StrictSpans mode is meant to enforce the invariant that a parent span cannot
   end while it has children running. If a parent span ends with active children, it is held open
   and its end is triggered when the last child ends. This works even with a chain of spans, the last child
   can trigger all parents up to the root to end.
   
   Details:
   1. Switch running_span_store_impl to key its map on SpanId instead of the pointer
   2. Add FindSpanById method on RunningSpanStoreImpl
   3. Add reference count called active_child_count_ on SpanImpl to keep track of active children
   4. Add logic at span start and end time to update the reference count on parents,
   5. Add tests

   Jack Ferris committed Mar 28, 2019
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