useSigner
[Hook](https://github.com/alchemyplatform/aa-sdk/blob/main/account-kit/react/src/hooks/useSigner.ts) for accessing the current Alchemy signer within a React component. It uses a synchronous external store for updates. This is a good use case if you want to use the signer as an EOA, giving you direct access to it. The signer returned from `useSigner` just does a `personal_sign` or `eth_signTypedData` without any additional logic, but a smart contract account might have additional logic for creating signatures for 1271 validation so `useSignMessage` or `useSignTypeData` instead.
