async createUser(request) {
    const content = request.getBodyObject("content");
    const profileIds = request.getBodyArray("content.profileIds");
    const humanReadableId = request.getString("kuid", "human") !== "uuid";

    return this._persistUser(request, profileIds, content, { humanReadableId });
  }
Creates a new User object in Kuzzle's database layer

@param {Request} request
@returns {Promise<Object>}