aelf-web3.js - The integration of multi-transaction with portkey/web-login/dapp

### Description
Coordinate with the upstream. Provide a doc for upstream.
![Image](https://github.com/user-attachments/assets/66e794d8-e365-449f-901d-1bb193784013)


### Tasks
- [x] Move the logic of multiTransaction to the contract to support different methods for two chains
- [ ] Portkey
- [ ] aelf-web-login
- [ ] Dapp etc.