find_proto function should cache results

[rossengeorgiev]

https://github.com/ValvePython/dota2/blob/eb8d814b6404448a0fe40f2ebb37e020cac0edda/dota2/msg.py#L46

[m-bo-one]

@rossengeorgiev, how about default functools cache https://gist.github.com/DeV1doR/366d7135559763dade0cd4940f14ba48 ?

[rossengeorgiev]

Yep, that's one option. Not sure if I want to add an unmaintained backport. cachetools seems like a much better choice.