[IR][Relay] Rewrite/Refactor WellFormedness check

[jroesch]

Tracking this as part of follow up work for the diagnostics. The current wellformedness check only looks at a single function, does not report descriptive errors and has some challenges when running on a whole module at once.

We should consider refactoring it more aggressively now that the diagnostic changes are landing in TVM.

cc @altanh

[jroesch]

  // need to kind check at the end because the check can look up
  // a definition potentially
  // CHECK(relay::KindCheck(type, GetRef<IRModule>(this)) == TypeKind::kTypeData)
  //     << "Invalid or malformed typedata given to module: " << type;

[jroesch]

For example we can't incrementally kind check type definitions anymore as they may refer to out of order type definitions which we want to support.