Commits on Nov 5, 2024

1. spanner: implement generation and propagation of "x-goog-spanner-requ… …

   …est-id" Header
   
   This change adds sending over the "x-goog-spanner-request-id" header
   for every unary and streaming call, in the form:
   
   	<processId>.<clientId>.<requestCountForClient>.<channelId>.<rpcCountForRequest>
   
   where:
   * processId is a randomly generated uint32 singleton for the lifetime of a process
   * clientId is the monotonically increasing id/number of gRPC Spanner clients created
   * requestCountForClient is the monotonically increasing number of requests made by the client
   * channelId currently at 1 is the Id of the client for Go
   * rpcCountForRequest is the number of RPCs/retries within a specific request
   
   This header is to be sent on both unary and streaming calls and it'll
   help debug latencies for customers. After this change, the next phase shall
   be providing a mechanism for customers to consume the requestID and log it
   along with the documentation for how to accomplish that.
   
   Updates googleapis#11073

   

   odeke-em committed Nov 5, 2024
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