Allow providers to pass a list of allowed plural resource names

[praneetloke]

Resource name suffixes are trimmed of their "s" to join up the various operations. But some resource names are valid in their plural form. For example, while Databases is not a valid name for a resource (since it doesn't make sense that one would create multiple databases with one resource) and should be represented in the resources map as Database, a resource called Tags is likely legal because it could be a resource that allows the user to apply several tags to a resource and so Tags should be left alone. Another example is Kubernetes which should not be trimmed obviously but that's already part of the default list.