fix: Check extreme predicates and constants in all types, not just classes

[cpitclaudel]

The bug was latent in 923f812 (for datatypes), but the issue with const only
became exploitable in c5562f2 (previous to that Boogie's own cyclicity checks
replaced the missing ones in Dafny).

• Source/Dafny/Resolver.cs (ResolveTopLevelDecls_Core):
  Run member checks on all declarations with members — not just on classes.

Closes #2506.

We were running none of the extreme lemma checks for datatypes, newtypes, and abstract type members. I added tests, but for casual readers, here are four examples:

  datatype T = A {
    static const a := 1 + b;
    static const b := 2 + a;

    static predicate F() decreases 0 { !L() }
    static least predicate L() { F() }

    static least predicate Negative() { !Negative() }
    static least predicate Ensures() ensures false { Ensures() }
  }

  method Oops0() ensures false { var _ := T.Ensures(); }
  method Oops1() ensures false { var _ := T.a; }
  method Oops2() ensures false { var _ := T.F(); }
  method Oops3() ensures false { var _ := T.Negative(); }