SDK to create and send UserOperation

This package provides 2 APIs for using UserOperations:

- Low-level "walletAPI"
- High-level Provider

LowLevel API:

$3

An abstract base-class to create UserOperation for a contract wallet.

$3

An implementation of the BaseWalletAPI, for the SimpleWallet sample of account-abstraction.

``typescript
owner = provider.getSigner()
const walletAPI = new SimpleAccountAPI({
provider,
entryPointAddress,
owner,
factoryAddress
})
const op = await walletAPI.createSignedUserOp({
target: recipient.address,
data: recipient.interface.encodeFunctionData('something', ['hello'])
})
`

High-Level Provider API

A simplified mode that doesn't require a different wallet extension.
Instead, the current provider's account is used as wallet owner by calling its "Sign Message" operation.

This can only work for wallets that use an EIP-191 ("Ethereum Signed Message") signature (like our sample SimpleWallet)
Also, the UX is not great (the user is asked to sign a hash, and even the wallet address is not mentioned, only the signer)

`typescript
import { wrapProvider } from '@account-abstraction/sdk'

//use this account as wallet-owner (which will be used to sign the requests)
const aaSigner = provider.getSigner()
const config = {
chainId: await provider.getNetwork().then(net => net.chainId),
entryPointAddress,
bundlerUrl: 'http://localhost:3000/rpc'
}
const aaProvider = await wrapProvider(provider, config, aaSigner)
const walletAddress = await aaProvider.getSigner().getAddress()

// send some eth to the wallet Address: wallet should have some balance to pay for its own creation, and for calling methods.

const myContract = new Contract(abi, aaProvider)

// this method will get called from the wallet address, through account-abstraction EntryPoint
await myContract.someMethod()
``