[Prototype] Add CLI app log queries

[rmcnews]

WHY are these changes introduced?

Prototype query access to app logs from Shopify CLI.

WHAT is this pull request doing?

Adds a hidden, opt-in app logs query command with time-window, result-limit, offset, and event-type flags, returning JSON. Local-only prototype for review; not intended to merge or release.

How to manually test your changes?

node packages/cli/bin/dev.js app logs query --help

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes
• I've considered analytics changes to measure impact
• The change is user-facing — I've identified the correct bump type and added a changeset

Co-authored by AI (GPT-5)