Add documentation for the upcoming Sentry integration

Author: emyller

docs/docs/integrations/error-tracking/sentry.md

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+---
+title: Sentry Integration
+description: Integrate Flagsmith with Sentry
+sidebar_label: Sentry
+hide_title: true
+---
+
+![Sentry logo](/img/integrations/sentry-logo.svg)
+
+Integrate Flagsmith with Sentry to enable feature flag [Change Tracking](https://docs.sentry.io/product/issues/issue-details/feature-flags/#change-tracking).
+
+:::tip
+
+Along with _Change Tracking_, Sentry also offers [Evaluation Tracking](https://docs.sentry.io/product/issues/issue-details/feature-flags/#evaluation-tracking).
+Integrating with _Evaluation Tracking_ is currently only possible via our [OpenFeature provider](/clients/openfeature.md).
+
+:::
+
+
+## Integration Setup
+
+1. **In Sentry**
+  1. Visit the [feature flags settings page](https://sentry.io/orgredirect/organizations/:orgslug/settings/feature-flags/change-tracking/) in a new tab.
+  1. Click the "Add New Provider" button.
+  1. Select "Generic" in the dropdown that says "Select a provider".
+  1. Copy the provided Sentry webhook URL — we'll use that soon.
+  1. **Do not close this page!** We're not done yet.
+1. **In Flagsmith**
+  1. Go to Integrations > Sentry > Add Integration.
+  1. Choose the Environment from which Sentry will receive feature flag change events.
+  1. Paste the URL copied above into "Sentry webhook URL".
+  1. Copy the secret from "Webhook secret".
+  1. Click "Save". ✅
+1. **Back to Sentry**
+  1. Paste the secret copied above.
+  1. Click "Add Provider". ✅
+
+Flag change events will now be sent to Sentry, and should be displayed in issue details.
+For more information, visit Sentry's [Issue Details page documentation](https://docs.sentry.io/product/issues/issue-details/#feature-flags).