Improve ids pass

[DCupello1]

This pull request is made to introduce the "improves-ids" pass.

This pass goes through all of the ids and makes sure that there is no ambiguity between names. It also gives names to anonymous constructors using the type name.

Some examples:

syntax bit = 
  | `%`{i : nat}(i : nat)
  
def $min(nat : nat, nat : nat) : nat
  def $min{i : nat, j : nat}(i, j) = i
    -- if (i <= j)
  def $min{i : nat, j : nat}(i, j) = j
    -- otherwise

to

syntax bit = 
  | mk_bit{i : nat}(i : nat)

def $min(nat : nat, nat_0 : nat) : nat
  def $min{i : nat, j : nat}(i, j) = i
    -- if (i <= j)
  def $min{i : nat, j : nat}(i, j) = j
    -- otherwise

Based off of #195 so will have to merge that one first.

[DCupello1]

@nomeata
This pass now only focuses on disambiguation of ids, not adding explicit prefixes as before.

It now does not change ids based on a reserved list of names, since this was pretty Rocq-specific. You will probably have to do some sort of check in your lean translation.

[nomeata]

Thanks!

You will probably have to do some sort of check in your lean translation.

Right, I already have that

let render_id a = match a with
  | "mut" | "local" | "export" | "import" | "catch" | "syntax"
    -> "«" ^ a ^ "»"
  | _ -> a