Add `noself=True` parameter (equivalent to "aiocache" package)

Source code for aiocache.decorators

    :param noself: bool if you are decorating a class function, by default self is also used to
        generate the key. This will result in same function calls done by different class instances
        to use different cache keys. Use noself=True if you want to ignore it.

[Krukov]

@AIGeneratedUsername So I remade the decorator that @unmade suggested and we will have the next solution

from cashews import cache, noself
class MyClass:
    @noself(cache)(ttl="2h")
    async def get_name(self, user, version="v1"):
         ...

I described this in the documentation, can you take a look on it in the MR ? As you see my english not so well - so any comments are welcome

[Krukov]

I did research and I found an issue why this parameter was added to aiocache - aio-libs/aiocache#129 - nothing special, I mean that the there are no reason why method that need to be cached use self , but self is not used in value that will be in cache - it should be static or class method.

I have no doubt that it is useful for existing code, so I suggest that we can add workaround that @unmade made and put it to the documentation. We will have:

from cashews import cache, noself


class SampleClass:
  
   @noself(cache(ttl="1h"))
   async def(
       self,
       *args,
       **kwargs,
   ):
       ...