Add a helper to get canonical code from status
diff --git a/Makefile b/Makefile
index 2dc401a..1deadf5 100644
--- a/Makefile
+++ b/Makefile
@@ -3771,6 +3771,7 @@
     include/grpc++/impl/codegen/service_type.h \
     include/grpc++/impl/codegen/status.h \
     include/grpc++/impl/codegen/status_code_enum.h \
+    include/grpc++/impl/codegen/status_helper.h \
     include/grpc++/impl/codegen/string_ref.h \
     include/grpc++/impl/codegen/stub_options.h \
     include/grpc++/impl/codegen/sync.h \
@@ -3876,6 +3877,7 @@
     include/grpc++/impl/codegen/service_type.h \
     include/grpc++/impl/codegen/status.h \
     include/grpc++/impl/codegen/status_code_enum.h \
+    include/grpc++/impl/codegen/status_helper.h \
     include/grpc++/impl/codegen/string_ref.h \
     include/grpc++/impl/codegen/stub_options.h \
     include/grpc++/impl/codegen/sync.h \
@@ -4103,6 +4105,7 @@
     include/grpc++/impl/codegen/service_type.h \
     include/grpc++/impl/codegen/status.h \
     include/grpc++/impl/codegen/status_code_enum.h \
+    include/grpc++/impl/codegen/status_helper.h \
     include/grpc++/impl/codegen/string_ref.h \
     include/grpc++/impl/codegen/stub_options.h \
     include/grpc++/impl/codegen/sync.h \
@@ -4406,6 +4409,7 @@
     include/grpc++/impl/codegen/service_type.h \
     include/grpc++/impl/codegen/status.h \
     include/grpc++/impl/codegen/status_code_enum.h \
+    include/grpc++/impl/codegen/status_helper.h \
     include/grpc++/impl/codegen/string_ref.h \
     include/grpc++/impl/codegen/stub_options.h \
     include/grpc++/impl/codegen/sync.h \