Automatically create run configurations on project open/creation

[cursive-ghost]

When creating a new project, or opening one that has been cloned from e.g. GitHub, the user then always has to create a run configuration. It would be nice to automatically create a default one in some obvious cases:

1. When the user creates a new module (which includes creating a new Clojure project), have a checkbox asking if they would like to create one. Default to yes in simple/common cases, e.g. creating a single-module project.
2. When the user opens an existing project from a deps.edn or project.clj, and there's only a single module. This case is tricky because there's no UI, so we'll assume the user will want one.