add finalized and safe block

[hadv]

What does this PR do?

To support new rpc block number types after the merge of ethereum https://github.com/ethereum/go-ethereum/blob/master/rpc/types.go#L64

to resolve #1772

Where should the reviewer start?

https://github.com/ethereum/go-ethereum/blob/master/rpc/types.go#L64

Why is it needed?

web3j client can query the new type of block supported by ethereum after the merge