Add generic support on next release?

[tsh96]

Go will add generic feature on next release(1.18). This feature can bring a significant benefit like static type checking for user.

[frederikhors]

I would really like! And it would also be useful code to learn how to use the new generics!

[errorhandler]

As part of my own learning around generics I've created a fork that is all generics based, for those interested. More than happy to contribute upstream!

[pavelnikolov]

https://github.com/graph-gophers/dataloader/pull/84

[csilvers]

(I don't have the necessary permissions, but I think this can be closed now.)