new rule - ban unsafe multiple inheritance

basedpyright's [`reportUnsafeMultipleInheritance`](https://docs.basedpyright.com/latest/benefits-over-pyright/new-diagnostic-rules/#reportunsafemultipleinheritance) reports an error when inheriting from multiple classes with `__init__` or `__new__` methods, because it's impossible to statically verify on the definition of each base class that all of the constructors will be called, and with their correct arguments.

it would be nice if pyrefly had a rule for this too.