Use ParamSpec for wrapped signatures

[Dreamsorcerer]

Fixes #504.

There are still a couple of issues with this.

1. Typing doesn't seem to work correctly with instance methods. Not sure exactly what is going wrong here, needs some more investigation.
2. partial() use will cause new type errors. We can either wait until partial() is properly supported by typedshed/mypy (functools.partial should use PEP612 ParamSpec (depends on #8708) python/typeshed#8703 / functools.partial support python/mypy#1484), or we could expose a TypeAlias of _LRUCacheWrapper so it can be used in type annotations.
3. There also seems to be an issue with pypy, possibly a bug in pypy, but needs further investigation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.92%. Comparing base (f60bf71) to head (0e56d88).
Report is 52 commits behind head on master.

❗ Current head 0e56d88 differs from pull request most recent head c8156f9

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #508      +/-   ##
==========================================
+ Coverage   96.88%   96.92%   +0.03%     
==========================================
  Files          12       12              
  Lines         770      780      +10     
  Branches       91       93       +2     
==========================================
+ Hits          746      756      +10     
  Misses         22       22              
  Partials        2        2              

Flag	Coverage Δ
unit	96.53% <91.66%> (-0.22%)	⬇️

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[asvetlov]

Good step forward, thanks!

[Dreamsorcerer]

I'll review this soonish and see if I can get the last issues resolved.

[Vizonex]

@Dreamsorcerer As someone who would like to see these features get added myself, I also made my own version before seeing this Pull Request that injects Paramspec correctly as well as correctly defining Class Methods with the use of Concatenate to determine if there is a class method being used perhaps I would be willing to step in and help you complete your Pull request

_Coro = Coroutine[Any, Any, _R]
_CB = Callable[_P, _Coro[_R]]
_CBOM = Union[_CB[_P, _R], _CB[Concatenate[Self, _P], _R]]
_CBP = Union[_CBOM[_P, _R], "partial[_Coro[_R]]", "partialmethod[_Coro[_R]]"]

I call _CBOM A "Callable Or Method" but I think I simplified it to _CBM in my PR if I remember correctly.

For some reason it didn't branch to your pull request specifically but I hope my additions to your pull request will at least excite you. I do give you credit though for coming up with this solution to begin with.
#639