Improve inference for --new-typechecker

[janmasrovira]

This pr applies a number of fixes to the new typechecker.
The fixes implemented are:

1. When guessing the arity of the body, we properly use the type information of the variables in the patterns.
2. When generating wildcards, we name them properly so that they align with the name in the type signature.
3. When compiling named applications, we inline all clauses of the form fun : _ := body. This is a workaround to Bug in typechecking (inference generates ill-scoped terms) #2247 and Typechecking infers incorrect types #2517
4. I've had to ignore test027 (Church numerals). While the typechecker passes and one can see that the types are correct, there is a lambda where its clauses have different number of patterns. Our goal is to support that in the near future (Functions with clauses with differing number of patterns type-check but are not correctly compiled #1706). This is the conflicting lambda:

   mutual num : Nat → Num
     := λ : Nat → Num {| (zero : Nat) := czero
     | ((suc n : Nat)) {A} := csuc (num n) {A}}
   

5. I've added non-trivial a compilation test involving monad transformers.

[paulcadman]

I also tested compilation of juvix-containers etc. with the new typechecker.

[janmasrovira]

I also tested compilation of juvix-containers etc. with the new typechecker.

thanks!