EpochFromString converts a string into Epoch.

PubKeyFromHex takes in a hex string, verifies its length as 48 bytes, and converts that representation.

RootFromHex takes in a hex string, verifies its length as 32 bytes, and converts that representation.

SlotFromString converts a string into Slot.

Uint64FromString converts a string into a uint64 representation.

Use an interface with a private dummy function to force all other packages to call NewNodeConnection.