address: Investigate supporting deepparse

[adamdecaf]

GRAAL-Research/deepparse is a new project that parses/normalizes postal addresses with deep learning techniques. It's a modern alternative to libpostal.

We should investigate it's usage / performance within Watchman, as libpostal can bottleneck.

There's a Go client available: https://github.com/adamdecaf/deepparse-go

[adamdecaf]

This seems less needed now due to running a single CGO instance of libpostal. We haven't seen improvements from running postalpool (the worker pool of binaries).