feat: hyperapp returns any Rust type, not just Result

[jurij-jukic]

This is how it looks like in generated caller utils, for ease of reading:

export function parseResponse<T>(response: any): T {
  try {
    if ('Ok' in response && response.Ok !== undefined && response.Ok !== null) {
      return response.Ok as T;
    }

    if ('Err' in response && response.Err !== undefined) {
      throw new ApiError(`API returned an error`, response.Err);
    }
  } catch (e) {
    return response as T;
  }
  return response as T;

[jurij-jukic]

#386

[nick1udwig]

lgtm