Aserto Node library drags in express dependencies for users on fastify

The team shipped exactly that as a new package: topaz-node, available at aserto-dev/topaz-node and on npm, which contains the directory client without the express helpers. The reporter confirmed it exists and works.

Source: https://github.com/aserto-dev/aserto-node/issues/121

Source: https://github.com/aserto-dev/aserto-node/issues/121