feat: add signInWithWeb3 with solana

[hf]

Adds signInWithWeb3 which allows sign in with Solana.

Example usage

First connect to the user's wallet then:

const wallet = useWallet()

<Button onClick={() => {
  await supabase.auth.signInWithWeb3({ chain: 'solana', wallet, statement: "Custom message" })
}}>
  Sign in with Solana
</Button>

It also works without Wallet Standard, at least with Phantom, Solflare and Brave by reading the window.solana object or you can custom send a wallet object that satisfies the signIn() or signMessage() APIs.

Additionally you can sign the message yourself and send it via the raw API:

await supabase.auth.signInWithWeb3({
  chain: 'solana',
  message: 'supabase.com wants you to sign in with your Solana account:\n...',
  signature: signatureUint8Array,
})

[hf]

As for tests, they'll come in a follow up PR because the DX needs to be proofed out once again in the RC.