Apibara Example Chapter

[machuwey]

Example chaper using Apibara DNA to stream Starknet data into a MongoDB database.

Server-Side Code:

The server-side example utilizes Apibara's TypeScript SDK to:

1. Initiate a real-time data stream from StarkNet using Apibara's SDK capabilities.
2. Identify and listen for swap events specifically emitted by the AVNU contract.
3. Process and prepare the raw data for proper storage in a MongoDB database.
4. Persistently store the swap event data into MongoDB.

Frontend Visualization:

To complement the data streaming backend, the frontend code example demonstrates how to:

Connect to the MongoDB database and subscribe to new data entries.
Display the AVNU swap events in real-time, enabling users to track StarkNet swaps as they happen.

Closes #331

[gianalarcon]

Great job! Awesome contribution. @machuwey Let me know if you still plan to add something to your PR. It looks good

[machuwey]

I think we can merge it for now. I still have some improvements would like to make, but think it pretty much gets the job done.