fix: add rpc request object to debug logging (#696)

Fixes #695

Author: Chris Rossi

packages/google-cloud-ndb/google/cloud/ndb/_datastore_api.py

@@ -89,6 +89,7 @@ def rpc_call():
         rpc = _remote.RemoteCall(call, rpc_name)
         utils.logging_debug(log, rpc)
         utils.logging_debug(log, "timeout={}", timeout)
+        utils.logging_debug(log, request)
 
         try:
             result = yield rpc