fix(all): pass raw value for optional arguments of native bindings

[MangelMaxime]

The need for this optimization is coming from TypeScript because in scenario like

 export function prettyPrint(space: int32, value: any): string {
      return JSON.stringify(value, undefined, some(space));
      //                                      ^^^^^^^^^^^  wraps in Fable Option
  }

some(space) is not able to resolve to string | number because it is inferred as Option<int32>

The optimization is not able to pick up all the external calls. For example, in Fable interface are erased by default and considered external calls by default.

But if people want to opt-in for this optimization they can add [<Erase>] attribute to it.