feat: show usage metrics on our explorer page

[jenpaff]

Describe the solution you'd like

It would be great to show some usage metrics on our explorer e.g.

• num of transactions (num of the past 24hrs)
• total num of accounts (num of accounts created 24hrs)

Just examples, happy to riff on a complete list of metrics we'd like to see.

[bennytimz]

I’d like to work on adding usage metrics to the explorer page and submit a fix. Could someone point me to the relevant files or components for this feature?