Support managing locations for platforms

[FRules]

When I create a platform, I need to specify a location using location_ref:

location_ref = {
  name = "europe"
}

This location needs to exist, otherwise I get the following error:

Could not create platform, unexpected error: unexpected status code: 404, {"message":"Could not find the selected location europe","errorCode":"NotFound","errorId":"e8uBsdkobZ"}

I do not see an option in the provider to create this location. So currently, I need to create it manually using the UI. It would be nice if this can also be created via the provider such that everything can be automated.

[Jelledb]

Just to let you know we actually long-term plan to get rid of the concept of "Locations" so we will most likely not invest too much effort into this corner of meshStack.