Setting an endpoint's operationId?

Hey, thanks for building this. I was looking for a way to set the operationId described [here](https://swagger.io/docs/specification/paths-and-operations/). Is this currently possible?

Start by locating the OpenAPI generation entry point and tracing how SvelteKit endpoints are represented in the generated specification. Determine where an operationId could be configured, then verify the expected behavior against the linked OpenAPI guidance. Done means the supported configuration and its generated operationId are clear and covered by an appropriate check.

Written by the indexing model from the issue text.