[Annotations] Rewrite annotations service in Go & Fiber

[guneyizol]

We have limited storage and memory capacity in our production environment. Go and the Fiber web framework provides a very efficient runtime in terms of memory and time usage. For these reasons, it is worth the effort to reimplement our annotation service in Go using the Fiber framework.

[guneyizol]

After discussing with our teammates, we decided that we don't need a smaller deployment right now. So this issue can be closed with no further development.