Add Cross-Chain Messaging contract (Universal Router)

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The Universal Router (Messaging) is a contract on ZetaChain that enables cross-chain contract calls between EVM chains connected to ZetaChain. For example, it allows a contract on Ethereum to call (and transfer value to) a contract on BNB or Base.

The key difference between the Router and the ZetaChain Gateway is that developers using the Router don’t need to deploy anything on ZetaChain.

This is ideal for projects that already have contracts deployed on multiple EVM chains and want to connect them without implementing a universal app on ZetaChain.

https://www.figma.com/board/Up4s6KosSJsirG2bfqghOO/Untitled?node-id=0-1&t=K2VjGiXJ3vxj3TEe-1

Related PR: #38