Message signing

const signature = await rhinestoneAccount.signMessage(
  'Hello, world!',
  chain,
)

const signature = await rhinestoneAccount.signMessage(
  {
    raw: '0x1234',
  },
  chain,
)

const signature = await rhinestoneAccount.signTypedData(
  {
    domain: {
      name: 'Ether Mail',
      version: '1',
      chainId: 1,
      verifyingContract: '0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC',
    },
    types: {
      Person: [
        { name: 'name', type: 'string' },
        { name: 'wallet', type: 'address' },
      ],
      Mail: [
        { name: 'from', type: 'Person' },
        { name: 'to', type: 'Person' },
        { name: 'contents', type: 'string' },
      ],
    },
    primaryType: 'Mail',
    message: {
      from: {
        name: 'Cow',
        wallet: '0xCD2a3d9F938E13CD947Ec05AbC7FE734Df8DD826',
      },
      to: {
        name: 'Bob',
        wallet: '0xbBbBBBBbbBBBbbbBbbBbbbbBBbBbbbbBbBbbBBbB',
      },
      contents: 'Hello, Bob!',
    },
  },
  chain,
)