Add CLI for flush/invalidate/list

[ryanmitchell]

Adds three commands for managing the cache tracker outside of the Control Panel, useful for deployment scripts, scheduled tasks, and debugging.

Commands

• cache-tracker:flush — Invalidates and removes all tracked URLs from the tracker
• cache-tracker:invalidate {url} — Removes a single URL from the tracker and invalidates it from the static cache; exits with code 1 if the URL isn't tracked
• cache-tracker:list [--url=] — Displays a table of all tracked URLs and their tags; accepts an optional --url flag with wildcard prefix support (e.g. --url=https://example.com/blog/*) to filter results