Hash in DashDependency does not take class name into account

In

https://github.com/plotly/dash/blob/e727dd7e37d20147f6eefbdd35bd12319a026b27/dash/dependencies.py#L27

the hash is implemented as

def __hash__(self):
    hash(str(self))

where

def __str__(self):
    return "{}.{}".format(self.component_id_str(), self.component_property)

def __repr__(self):
    return "<{} `{}`>".format(self.__class__.__name__, self)
                                                        

so that an Input and State with the same id would yield the same hash-value.

I plan to insert Input and State objects into a dict, and this could cause issues.

Start in dash/dependencies.py around line 27 and inspect how DashDependency, Input, and State define hash, str, and repr. Compare the dictionary behavior for Input and State instances with the same id and property, then add or update regression coverage so the class distinction is handled as intended.