Support placing the vue files in subdirectories of Assets/Scripts/VueComponents (OSOE-825)

[sarahelsaig]

Right now all .vue files have to be placed directly in Assets/Scripts/VueComponents. This is because:

1. Orchard Core IShapeTemplateHarvester doesn't support recursive discovery.
2. The script compiler only looks for vue files directly in that directory.

I think (2) may be easy to fix by using glob to find the files instead of just reading the directory.
On the other hand (1) is a trouble because I think OC intentionally doesn't support recursive discovery there. Likely we will have to create our own alternative implementation to ShapeTemplateBindingStrategy.

Jira issue