Implement HIR visitor

[DaniPopes]

Describe the feature

Implement HIR visitor traits and functions using the visitor macro, similar to the AST ones.

The main difference here is that we need to recurse using the Hir struct, which means that there should be an extra fn hir(&self) -> Hir<> method to return it and that is used in the other methods to recurse.

Additional context

No response

[mahmudsudo]

hi, can i take on this ?

[mahmudsudo]

Any update on this ?

[DaniPopes]

Sure go ahead

[mahmudsudo]

Ok on it

[gakonst]

hey @mahmudsudo any update here? also would love for people to describe the solution they want to design before asking for taking it!