Add Agent Monitoring Support

[matejminar]

Description

Add support for https://docs.sentry.io/product/insights/agents/ in JavaScript.

Please upvote SDKs you'd like us to focus on next or comment/create the ones we're missing.

We'll be evaluating this regularly and directing our focus based on factors like subjective potential, npm downloads, GitHub stars, upvotes, etc.

[audun-cobrief]

Request: @google/genai (https://github.com/googleapis/js-genai)

[RulaKhaled]

Added to the list. Thanks for recommending!