Multi-Container: Implement logging app as a sample Executor

[eddyashton]

We have implementations of the logging app in C++ and JS. We should also add one as an external Executor, probably in Python as that's what we have easy support for.

This will highlight what we need for feature parity. We can do this in multiple stages as we add gRPC support for more features (ie - get the request details in for basic request first, think about historical queries and indexing later).