feat: provide experimental flags to the defineCommand handler

[emily-shen]

currently, in order to access experimental flags you have to wrap each command handler in an AsyncLocalStorage context. this adds wraps it around the defineCommand handler so eventually the flags will be available to all commands.

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• Tests
  • TODO (before merge)
  • Tests included
  • Tests not necessary because: I think not breaking existing tests that use experimental flags should be sufficient?
• E2E Tests CI Job required? (Use "e2e" label or ask maintainer to run separately)
  • I don't know
  • Required
  • Not required because:
• Public documentation
  • TODO (before merge)
  • Cloudflare docs PR(s):
  • Documentation not necessary because: internal helper

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---

[email protected] includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	workspace:*	3.20241205.0
workerd	1.20241205.0	1.20241205.0
workerd --version	1.20241205.0	2024-12-05

Please ensure constraints are pinned, and miniflare/workerd minor versions match.

[andyjessop]

I like this change. Maybe we can go further in the future and remove ALS entirely, as it adds an extra layer of complexity and it's usually unnecessary, making the execution flow harder to understand.