safe-global / safe-smart-account / 9780230154

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Add Safe to L2 Setup Contract (#759)

This PR introduces a setup contract that can be called from the `Safe`
setup function in order to automatically promote a Safe at setup time if
the code is executing on an L2. Namely, this allows the Safe Proxy
factory to use a single singleton and initializer for all chains, but
end up with different `singleton`s depending on the chain ID.

The expected use of this contract is to use the standard proxy factory:

```solidity
Safe l1Singleton;
SafeL2 l2Singleton;
SafeToL2Setup l2Setup;

proxyFactory.createProxyWithNonce(
    address(l1Singleton),
    abi.encodeCall(
        l1Singleton.setup,
        (
            owners,
            threshold,
            address(l2Setup),
            abi.encodeCall(l2Setup.setupToL2, address(l2Singleton)),
            fallbackHandler,
            paymentToken,
            payment,
            paymentReceiver
        )
    ),
    saltNonce
)
```

On L1 (i.e. Ethereum Mainnet where `chainId == 1`), you would end up
with a Safe where `safe.singleton == l1Singleton` and on any other
chains, you would end up with `safe.singleton == l2Singleton`. This
would happen _before_ the first transaction.

---------

Co-authored-by: Mikhail <16622558+mmv08@users.noreply.github.com>

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