feat(x-goog-spanner-request-id): introduce AtomicCounter #1275
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This change introduces AtomicCounter, a concurrency/thread-safe counter do deal with the multi-threaded nature of variables. It permits operations:
that'll be paramount to bringing in the logic for
x-goog-spanner-request-id in much reduced changelists.
Updates #1261
Carved out from PR #1264