Need to add a package like @polkadot/api-augment to allow typescript to be able to infer types correctly

[ntduan]

Now polkadot js separates the types of dependency chain into a separate package. and now need to manually import . acala.js may also be considered to do so.

https://github.com/polkadot-js/api/tree/master/packages/api-augment

import '@polkadot/api-augment/polkadot'; // polkadot 

import '@acala-network/api-augment/acala'; //acala
import '@acala-network/api-augment/karura'; //karura