Use the configured Notifier to log messages

[fisco-unimatic]

The GrpcHttpServerFactory passes the configured notifier into the GrpcFilter.
The GrpcFilter stores that as a new field, and then passes it on to the handlers that it builds.
The handlers also store the notifier as a new field, and then set the it in the LocalNotifier thread-local before invoking stubRequestHandler.handle.

References

Issue#38 verbose console output

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