message: Complete the `bigint-type` e2e
diff: extern crate alloc;
  -use alloc::{format, string::String};
  +use std::ops::Mul;
  +
  use polywrap_wasm_rs::BigInt;
  pub mod w3;
  pub use w3::*;
  pub fn big_int_method(input: InputBigIntMethod) -> BigInt {
  - todo!()
  + let mut result = input.arg1.mul(input.obj.prop1);
  +
  + if input.arg2.is_some() {
  + result = result.mul(input.arg2.unwrap());
  + }
  + if input.obj.prop2.is_some() {
  + result = result.mul(input.obj.prop2.unwrap());
  + }
  +
  + result
  }
  