[New rules request] Empty class and class with two methods, one of which is init

[Rizhiy]

Hi, not sure if this is the correct place, please point me in the right direction if not.
I've recently re-watched a good talk on not writing too many classes and was wondering if it is possible to implement a few recommendations giver there as rules.

Empty class rule: warn when the class just subclasses another while not doing anything, e.g.:

class MyDict(dict):
	pass

Class with two methods, one of which is __init__: warn when a class has only two methods, one of which is __init__, e.g.:

class Greeting:
    def __init__(self, greeting: str = "Hello") -> None:
        self._greeting = greeting

    def greet(self, name) -> None:
        print(f"{self._greeting} {name}!")

I did a quick search through existing rules, but couldn't find anything relevant.

[charliermarsh]

I think this is roughly what's implemented in #9601. I might suggest chiming in on or watching that PR!