client: Add support for zodburi
zodburi provides a way to open ZODB storages by URL/URI. It already has support for file:// zeo:// zconfig:// memory:// etc schemes out of the box and third-party-to-ZODB storages can add support for their schemes via providing zodburi.resolvers entrypoint.
For example relstorage and newtdb do this.
Let's also teach NEO to open itself via neo:// URI schema.