[feat] L3 Core Contract

[drspacemn]

Build out a minimal core contract for an L3 to utilize for state update.

Will be used for testing the query of the DA Oracle from the blobstream contracts, will be necessary for L3 integration.

References

messaging cairo contract - https://github.com/dojoengine/dojo/blob/main/crates/katana/core/contracts/messaging/cairo/src/appchain_messaging.cairo

solidity core contract - https://github.com/starkware-libs/cairo-lang/blob/master/src/starkware/starknet/solidity/Starknet.sol

[drspacemn]

Work will be done in piltover: https://github.com/keep-starknet-strange/piltover

[glihm]

Work will be done in piltover:

https://github.com/keep-starknet-strange/piltover

If you want you can assign it to me in addition to you. I'll try to push the first commits this week. 🫡