Instrument Google Cloud Storage client #269
                
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This PR adds instrumentation for
google-cloud-storageclient by wrapping thegoogle.cloud.storage._http.Connection.api_request()and extracting span data from the request made to Google Cloud Storage JSON API.Since
storage.Clientdoes not use this API to upload and download blobs, additional wrappers are needed to instrumentstorage.blob.Blob.{upload,download}_*calls.Batches are implemented as a wrapper for
storage._http.Connectionand thus also needed a special handling.