Add viem

[shaun97]

add ability to call the blockchain via the backend

ADMIN_WALLET_PRIVATE_KEY=0x... to the nev file

Import these viemWalletObject, viemPublicObject from server/constants

viemWalletObject

• for calls that require a wallet https://viem.sh/docs/actions/wallet/introduction.html

viemPublicObject

• for calls that are public information that do not require a wallet https://viem.sh/docs/actions/public/introduction.html