insights: create a multiregion insights page

**Is your feature request related to a problem? Please describe.**

Today, users are left to choose their own multiregion abstractions based on the documented behavior. Sometimes it requires trial and errors to get it right.

**Describe the solution you'd like**

It can be beneficial to introduce an insights page to identify query patterns and advise on the right multiregion abstractions.

**Describe alternatives you've considered**

N/A

**Additional context**
Add any other context or screenshots about the feature request here.

**https://cockroachlabs.slack.com/archives/C01RX2G8LT1/p1677249142319669**

Jira issue: CRDB-36910

Epic CC-28354

Start by reviewing the linked Slack discussion, Jira issue CRDB-36910, and epic CC-28354 to clarify the multiregion query patterns, intended advice, and page scope. The issue names no files, tests, or completion criteria, so those should be established before implementation.

Written by the indexing model from the issue text.