Bug#1123809: ITP: golang-github-joeshaw-gengen -- A Go source transformation tool for generics

["Arya Kiran" <arya@projectsegfau.lt>]

Package: wnpp
Severity: wishlist
Owner: Arya Kiran <arya@projectsegfau.lt>

* Package name    : golang-github-joeshaw-gengen
  Version         : 0.0~git20220404.14f6c87-1
  Upstream Author : Joe Shaw
* URL             : https://github.com/joeshaw/gengen
* License         : Expat
  Programming Lang: Go
  Description     : A Go source transformation tool for generics

 gengen - A generics code generator for Go

Though not required anymore after Go Generics became a thing, it is still used by many libraries and packages

In my case, I'm adding it since its required by golang-github-codesenberg-concurrent (https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1123729).