[RBAC] A version of has_obj_perm for multiple permissions

[AlanCoding]

The standard call from libraries is this:

https://github.com/encode/django-rest-framework/blob/a677b09729ed71014d65b90a86f75c47bf7ae32f/rest_framework/permissions.py#L299

if not user.has_perms(perms, obj):

But I called user.has_obj_perm with each permission. Why? Because I'm lazy. There was no reason, whatsoever, not to do it this better way. Yes, you can check all the object-level permissions in a single query. That would need to be implemented in a public method attached to the user model, or modify existing method.