Add blockchain explorer (blockscout)

[adrienmo]

📝 Summary

This adds a modified version of blockscout blockchain explorer to the dev environment docker-compose file.
Now, when running make devnet-up two additional containers will be started: blockscout and postgres. After few seconds, the explorer should be ready and can be accessed at: http://localhost:4000

In the blockscout repository, the setup with the docker-compose file starts 9 containers. Those extra containers represent extra features, such as UML visualization of solidity classes, smart contract verification, statistics, ... It also splits the backend and the frontend and put a proxy in front. In the context of a dev environment, I took a lightweight approach to have the minimum needed for the task of displaying the blockchain transactions locally and removed everything that was not needed for this task.

suave-geth exposes 2 new fields for transactions, namely wrapped and confidentialComputeResult, those 2 new fields are now exposed in the modified version of blockscout.

📚 References

• Modification done in blockscout for suave-geth
• Custom blockscout docker image

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• I have seen and agree to CONTRIBUTING.md