Write script that adds up ETXs by querying node with getblockbynumber

[mibuono]

• [ ] Write the script - either do that or parse the hash and parse the logs
• [ ] We need to get the inbounds and outbounds on ETXs on the canonical

We should be able to run a 3x3 test, use the script and get the canonical

This should be run on a full node.