Allow cached_result on function without args/kwargs, use func.__qualname__ in key

[Mark90]

In version 1.10.0 cached_result was changed to not allow using it on a function without args/kwargs.

This was an oversight: it works perfectly fine thanks to the function name itself being prefixed in the cache key.

Re-instated that behavior, now using func.__qualname__ instead of func.__name__ to have more context in the key.

Example

class Client:

    @cached_result(...)  # without `key_name`
    async def get_foo(self):
        ...

    @cached_result(...)  # without `key_name`
    async def get_bar(self, identifier: int):
        ...

Before this PR

• Client.get_foo: raises ValueError: Cannot generate cache key without args/kwargs")
• Client.get_bar: generates cache keys {prefix}:{version}:get_bar:((1, ), frozenset())

After this PR

• Client.get_foo: generates cache keys {prefix}:{version}:client.get_foo
• Client.get_bar: generated cache keys {prefix}:{version}:client.get_bar:((1, ), frozenset())

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.

Project coverage is 81.32%. Comparing base (fc02479) to head (cfe7889).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
nwastdlib/asyncio_cache.py	66.66%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #47      +/-   ##
==========================================
- Coverage   81.64%   81.32%   -0.32%     
==========================================
  Files          13       13              
  Lines         512      514       +2     
  Branches       70       71       +1     
==========================================
  Hits          418      418              
- Misses         73       74       +1     
- Partials       21       22       +1     

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