Truncate Address

[wojciech-turek]

Hi,

I am willing to create a PR for additional function inside address utils directory that will truncate the address.
I feel like its such a common thing that everyone has to do in their dApp, it almost begs to be implemented in a lib like viem.

Additional motivation is that something similar already exists in other packages like useDapp in form of shortenAddress.

Please let me know your thoughts on the above.