New tap and target templates
To get us one step closer to #2401 (closed) and #2402 (closed), we can create new cookiecutter templates for taps and targets as a (more permissively licensed, e.g. Apache 2) alternative to the existing https://github.com/singer-io/singer-tap-template and https://github.com/singer-io/singer-target-template.
Meltano users will be able to easily create a new extractor/loader using these templates and #2447 (closed). As we build the framework, we can update the templates to use it.