feat: polling-based tool monitoring

[idiotWu]

Resolves #43

This PR:

1. Added a npi_watch parameter to make all tools watchable
2. Added agent.when() method

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Name	Status	Preview	Comments	Updated (UTC)
npi-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 9, 2024 3:45am