logging improvements: blocksync module

[sergio-mena]

Tasks:

• First: check in v0.35.x/v0.36.x for any existing work on improving logs for blocksync
• Full audit of all logs, and their log level
• Circulate an example of the improved logs to other members of the team
• (stretch) Circulate example among (some of) our users

(this can be done on main directly)

DoD:

• Team has taken a look at the example, and approves the improvement
• (stretch) Users have taken a look at the example, and approve the improvement