Remove generics of Endpoint

[zhongwuzw]

I want to make a PR to remove generics of Endpoint. The reason based on:

Endpoint is a concrete class, and store some basic info about request. I cannot found any reason that Endpoint need uses generics.

Maybe my thoughts is one-sided, please let me know if it is.:beers::beers:

[AndrewSB]

It doesn't seem like a bad idea to me, but I can't imagine why the person who implemented the generics in Endpoint would do so for no reason. I think the easiest way to see why it's required is by attempting the PR. Maybe you'll find out if/why it can't be removed while attempting the change

[SD10]

@zhongwuzw I think @AndrewSB makes a good suggestion here. You can try and remove it by submitting a PR for this change. However, I can't guarantee it will be accepted.

[SD10]

#434 Is related

[sunshinejr]

Closing this one. It's already ⛵️in Moya 11.0.0-beta.2 🎉