Fix EnvInteractData with Python3.9

[sebimarkgraf]

This fixes #4 by changing the namedtuple to a dataclass.

[ssnl]

Thanks for the proposed fix! Can you change it so that it uses namedtuple still before 3.9? I tried to namedtuple for every case where things are getting created & destroyed in each iteration, and ideally would benefit from the lighter wrapper (of namedtuple compared to dataclass).

[sebimarkgraf]

I've changed it to use the NamedTuple from typing extensions.
In 3.11 this will be officially supported: python/cpython#92027

I am not sure about the performance benefits, this strongly depends on the use case and would probably need profiling here.

[ssnl]

Thanks!