Stop sharing class decorators across siblings

[prkumar]

I noticed that, when writing a superclass that is extended by two separate subclasses, class-level decorators are shared across the siblings. You can reproduce this issue with the following example:

class GitHub(Consumer):
    @get("users/{id}")
    def get(self, id):
        pass

@response_handler(lambda _: 2)
class GitHub2(GitHub):
    pass


@response_handler(lambda x: x.json())
class GitHub3(GitHub):
    pass


print(GitHub2("https://api.github.com").get_user("prkumar"))
print(GitHub3("https://api.github.com").get_user("prkumar"))

Running the above code snippet, you'll notice that the first invocation will throw an AttributeError since the response is wrapped by both lambda _: 2 and lambda x: x.json(); notably, the latter handler receives and int (i.e., 2) as it's input, which doesn't have a json method.

[codecov]

Codecov Report

Merging #152 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #152   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          41     41           
  Lines        2084   2110   +26     
  Branches      167    176    +9     
=====================================
+ Hits         2084   2110   +26

Impacted Files	Coverage Δ
uplink/arguments.py	100% <100%> (ø)	⬆️
uplink/decorators.py	100% <100%> (ø)	⬆️
uplink/builder.py	100% <100%> (ø)	⬆️
uplink/commands.py	100% <100%> (ø)	⬆️
uplink/retry/retry.py	100% <0%> (ø)	⬆️

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