Adds request as a parameter to json_success as a refactor towards
making `ignored_parameters_unsupported` functionality available
for all API endpoints.
Also, removes any data parameters that are an empty dict or
a dict with the generic success response values.
Since mypy doesn't accept redefinition of the same variable within the
same scope, we need to use type annotations with Union to correctly
type aggregate_table. Note that the type cast is necessary for mypy to
narrow the type of aggregate_table.
For types like `Union[Realm, UserProfile, Stream]` and
`Union[AnonymousUser, AbstractBaseUser]`, we need assertions to
tell mypy which type we would be expecting.
Lauryn Menard
Tim Abbott
PIG208