Add block size benchmarking scripts

[alexromanov]

Description

Add scripts to generate summary statistics by node for block propagation time (based on logs)

Checklist

• Commit sequence broadly makes sense and commits have useful messages.
• The size limit of 400 LOC isn't needlessly exceeded
• [-] The PR refers to a JIRA ticket (if one exists)
• [-] New tests are added if needed and existing tests are updated.
• New code is documented and existing documentation is updated.
• [-] Relevant logging and metrics added
• [-] Any changes are noted in the changelog.md for affected crate
• Self-reviewed the diff