supabase / auth / 16492281791

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feat: add sign in with ethereum (#2069)

Adds Sign in with Ethereum. Configure it by:

```
GOTRUE_EXTERNAL_WEB3_ETHEREUM_ENABLED="true"
GOTRUE_EXTERNAL_WEB3_ETHEREUM_MAXIMUM_VALIDITY_DURATION="10m"
```

SIWS & SIWE are based off of EIP-4361, which is referenced here:
https://eips.ethereum.org/EIPS/eip-4361, so they are close in
implementation with slight differences between address/signature
verification format & algorithm.

For Ethereum, specifically the signature verification part, It requires
recovering the public address from the signature, and then testing the
signature against it, with the algorithm Ethereum uses, this is tedious
to implement without using the https://github.com/ethereum/go-ethereum
package, as the verification has some error correction that it does,
would be hard to test/maintain without the dependency, let me know what
you think.

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