chore(x-goog-spanner-request-id): add SessionImpl.getChannel() and Options.RequestIdOption.(equals, hashCode)#3900

olavloite merged 2 commits intogoogleapis:maingoogleapis/java-spanner:mainfrom

odeke-em:x-goog-spanner-request-id-SessionImpl.getChannelodeke-em/java-spanner:x-goog-spanner-request-id-SessionImpl.getChannelCopy head branch name to clipboard