L2 -> L1 chain

[Lawliet-Chan]

docs:
https://docs.starknet.io/documentation/architecture_and_concepts/Network_Architecture/messaging-mechanism/
https://book.cairo-lang.org/ch16-04-L1-L2-messaging.html

madara codes: https://github.com/keep-starknet-strange/madara/blob/main/crates/client/commitment-state-diff/src/lib.rs
madara-orchestrator codes： https://github.com/karnotxyz/madara-orchestrator/tree/main （not complete yet）

[neilydhan]

refer to madara, scroll