TOSCA types for specific locations should be imported in a4c when importing the plugin itself

[loicalbertin]

Currently TOSCA types specific to a given location (GCP, AWS, Slurm, and so on...) are imported in Alien when creating the first location of this given type.

This is particularly painful when importing TOSCA components that reference those location-specific types as we should first create a location. Importing a whole git forge can be a nightmare in this case.

I do not see any reason to not import these types when we import the plugin as we do for Yorc global/generic types.

[loicalbertin]

Ok finally found why we do it this way:
When importing TOSCA types globally at the plugin level the logic in Alien is first to parse all types then index them into the catalog. So if we do have imports that reference types that are also at plugin level then Alien fails to parse them.