EVM: Create a shared crate for common EVM types

[Stebalien]

At least EthAddress, but likely more.

We now have two Ethereum related actors (EVM & EAM) and will soon have at least one more for an Ethereum Account (and possibly a fourth "Virtual" Ethereum Account).

[maciejwitowski]

This lands into "highly annoying" zone. We will move it to M2.2. Discussed with @Stebalien