Add Sentry tracing

And other configuration options.

See:
- https://github.com/zentered/fastify-sentry
- https://docs.sentry.io/platforms/node/enriching-events/transaction-name/

The issue references fastify-sentry integration and Sentry transaction naming docs. Start by examining the existing fastify-micro configuration and plugin system to see where tracing can be added. Look at the linked fastify-sentry repository for integration patterns. Determine what 'other configuration options' might be needed by checking Sentry's Node.js SDK documentation. A successful implementation will enable Sentry tracing within the framework and expose relevant configuration.

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