Add support for relayer EIP-7702 authorizations

[patrislav]

Usage:

signedTxns, err := w.SignTransactions(ctx, sequence.Transactions{txn})
if err != nil { /* ... */ }

authNonce, err := w.GetProvider().PendingNonceAt(ctx, w.Address())
if err != nil { /* ... */ }

auth, err := gethTypes.SignSetCode(w.privateKey, gethTypes.SetCodeAuthorization{
	ChainID: *uint256.NewInt(chainID),
	Address: common.HexToAddress(eip7702Implementation),
	Nonce:   authNonce,
})
if err != nil { /* ... */ }

signedTxns.Authorization = &auth

w.SendTransactions(ctx, signedTxns)

[attente]

Thanks @patrislav, can you please update this PR? The API that was merged was modified after your draft: https://github.com/0xsequence/relayer/commit/d4a3cf38d82e3a42a2282948cf53d841aca46d96#diff-5f9f2572ed9076fa74d6a441546c8f1fbd6ede05d457554b7adb361b692b3f17.

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