added from_bytes for Wallet type

[0xKitsune]

Motivation

There was no way to initialize a new Wallet from a byte slice.

Solution

I added a from_bytes associated function for the Wallet type. The function initializes a new SignerKey from a byte slice and uses the key to create a new wallet.

impl Wallet<SigningKey> {
    //--snip--
    pub fn from_bytes(bytes: &[u8]) -> Result<Self, WalletError> {
        let signer = SigningKey::from_bytes(bytes)?;
        let address = secret_key_to_address(&signer);
        Ok(Self { signer, address, chain_id: 1 })
    }
 }

PR Checklist

• Added Tests
• Added Documentation
• Updated the changelog
• Breaking changes

[gakonst]

nit: impl AsRef<[u8]> is slightly better but no need