Create an endpoint which acts as a proxy between Sentry and Outline

[apoorv-mishra]

Reference: #4298 (comment)

Docs: https://docs.sentry.io/platforms/javascript/troubleshooting/#dealing-with-ad-blockers

[apoorv-mishra]

It'd be good if #4505 lands before this one because then we can rate limit top level /tunnel endpoint with better error handling. Also, as a side note, we can match the endpoint's rate limits to sentry's rate limits.

[github-actions]

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[github-actions]

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