[JS SDK] Add docs for fsIntegration

docs/platforms/javascript/common/configuration/integrations/fs.mdx

@@ -0,0 +1,55 @@
+---
+title: FileSystem
+description: "Adds instrumentation for filesystem operations."
+supported:
+  - javascript.node
+  - javascript.aws-lambda
+  - javascript.azure-functions
+  - javascript.connect
+  - javascript.express
+  - javascript.fastify
+  - javascript.gcp-functions
+  - javascript.hapi
+  - javascript.koa
+  - javascript.nestjs
+  - javascript.electron
+  - javascript.nextjs
+  - javascript.nuxt
+  - javascript.sveltekit
+  - javascript.remix
+  - javascript.astro
+  - javascript.bun
+---
+
+<Alert level="info">
+
+This integration only works in the Node.js and Bun runtimes.
+
+</Alert>
+
+_Import name: `Sentry.fsIntegration`_
+
+The `fsIntegration` will create spans for `fs` API operations, like reading and writing files. The integration uses the [`@opentelemetry/instrumentation-fs`](https://www.npmjs.com/package/@opentelemetry/instrumentation-fs) package.
+
+<Alert level="warning" title="Potential Performance Overhead">
+  The `fsIntegration` may add significant overhead to your application.
+  Especially in scenarios with a lot of file I/O, like for example when you are
+  running a framework dev server, including this integration can massively slow
+  down your application.
+</Alert>
+
+## Options
+
+### `recordFilePaths`
+
+_Type: `boolean | undefined`_
+
+Setting this option to `true` will include any filepath arguments from your `fs` API calls as span attributes.
+Defaults to `false`.
+
+### `recordErrorMessagesAsSpanAttributes`
+
+_Type: `boolean | undefined`_
+
+Setting this option to `true` will include the error messages of failed `fs` API calls as a span attribute.
+Defaults to `false`.