This pull request introduces instrumentation for Nuxt middleware, ensuring that all middleware handlers are automatically wrapped with tracing and error reporting functionality. The integration is achieved through build-time transformation.

recap:

• Adds a new build-time Rollup plugin (middlewareInstrumentationPlugin) that automatically wraps all detected middleware handlers with Sentry instrumentation during the Nitro build process.
• Implements the wrapMiddlewareHandler utility, which wraps middleware handlers to start a Sentry span, capture request data, record exceptions, and flush events in serverless environments.
• Updates the Nuxt module setup to inject Sentry middleware imports and instrumentation hooks during initialization, ensuring the new tracing logic is included in server builds.

TODO:

• Test traces and span visibility.
• Add unit/integration tests.
• Add E2E tests.
• Check to see if there are other ways to add middleware that would bypass the transformer.