Function signSolanaMessage

signSolanaMessage(
options: SignSolanaMessageOptions,
): Promise<SignSolanaMessageResult>
Signs a message with a Solana account.
Parameters
- options: SignSolanaMessageOptions
  The options for the signing.
  
  Request parameters for signing a message with a Solana account.
  - solanaAccount: SolanaAddress
    The Solana account to sign the message with.
  - message: string
    The message to sign (base64 encoded).
Returns Promise<SignSolanaMessageResult>
The result of the signing.
Example
```
const user = await getCurrentUser();
const solanaAccount = user?.solanaAccounts[0];

const message = Buffer.from("Hello, Solana!", "utf8").toString("base64");
const result = await signSolanaMessage({
  solanaAccount,
  message // Base64 encoded message to sign
});
```