Make it possible to extract and analyze performance data - This is possible with errors today via webhooks

### Problem Statement LaunchDarkly recently created an integration with Sentry to automatically ingest error events from the platform, and attribute those errors with LD contexts for use in the LD experimentation platform. One thing we were additionally interested in adding was performance metrics (latency, in particular). This was said to not be possible at the time of integration, and so we only integrated with errors. It would be great if we could eventually handle performance data in the same way and provide LD customers with sentry latency events attributed to flag evaluations. ### Solution Brainstorm Surface latency webhook for integration use as a solution? ### Product Area Settings - Integrations ┆Issue is synchronized with this [Jira Improvement](https://getsentry.atlassian.net/browse/FEEDBACK-1895) by [Unito](https://www.unito.io)