Our API decorators and @augment_method_from attempted to set their own

function metadata (__name__, __doc__, etc.), rather than utilizing

Python's @wraps/update_wrapper functions. This meant that we weren't

keeping up with all the latest attributes, such as __annotations__ and

__qualname__.
This change switches some of our decorators over to this. It also

simplifies @webapi_response_errors to not require an inner function

call, modifying state on the original function instead, reducing API

overhead.

Unit tests pass.
Verified I could access the original function state (__qualname__ in

particular) when working with these functions.