Bump Go to 1.18 for generics implementation

[paul-leydier]

Hi everyone!

I was wondering, what is your position regarding the implementation of algorithms using generics on this repo?

Are you waiting a bit longer before upgrading to go 1.18, or should we do it now so that we can already start getting hands-on experience with generics?

If so, I recommend using the constraints defined in golang.org/x/exp/constraints as standard constraints!

[tjgurwara99]

I'm more than happy to bump the version now and I was thinking to start it but we need to do a bit of cleanup of the repository structure before we do that. Currently its all over the place 😓

I'll be opening a series of PR's to make these changes in an incremental (and traceable) way – will keep posting updates on this issue.

On the topic of constraints, I would like to use it but it's an experimental package and I would rather just create our own generic interfaces from ground up until we get some more data - that package was supposed to be just constraints instead of golang.org/x/exp/constraints but some members of the community didn't like this package for various reasons (mostly because of naming).

[tjgurwara99]

closed in #483