Implement the new `TransactionReceipts` subscription type

This was included in the latest Geth release: https://github.com/ethereum/go-ethereum/releases/tag/v1.16.5 .

> eth_subscribe now supports a transactionReceipts subscription.
> There is also a wrapper in ethclient for this new subscription type. (https://github.com/ethereum/go-ethereum/pull/32697, https://github.com/ethereum/go-ethereum/pull/32869)