Hmac working without generics, and test not working yet - #5652

This is a draft PR just to show what I have so far, the things I want to do before pulling in the PR are:

1. Get the unit tests of test_hmac.py working
2. make a generic function to use within the new_hash_hmac() functions for initialization, I just tried very hard to have it work like the hashlib stuff using generics, but I think because CoreProxy needs a type at compile time I can't initialize an hmac dynamically like it's being done for the HashWrapper. Might still play around with that a little, and if anyone know's a way I can use generics I would appreciate the advice, but I couldn't find a way to do it without having to pass a generic to HmacWrapper (as in it would have to be HmacWrapper which then I don't think I can use in PyHmac because I'm guessing it needs to be generic free for the front end).
3. Play around with NewHmacHashArgs since I get an error when trying to initialize hmac without msg, and digestmod should be able to take a function. I have a feeling the msg thing might be something deeper because it complains about the function in hmac.py expecting 0 arguments.

Other than that, playing with what I have vs the cpython version they output the same bytes when digesting.