Bootstrap Saya demo project with shard execution

[glihm]

To demonstrate Saya and Katana working together for a shard execution started from the settlement layer, first a demo project must be bootstraped to showcase this.

The idea here is to create an example with a Dojo project where a dungeon run will be executed on a Shard instead of the settlement layer.

• Create new branch for dojo updates on world.cairo.
• Create a new Dojo project with models related to the example.
• Implement the logic around the transaction that starts the shard execution.

[okhaimie-dev]

@glihm can i work with y'all on this? would love to get involved with saya related issues