allow custom `schemaRequestService` to be provided

[perezd]

Would this be possible? I am working in an environment known as Tauri, and I need to make use of a custom implementation of fetch it provides.

I think the best way to handle this would be to allow me to provide a function that implements the request service API.

[remcohaszing]

Great idea! This would require not only for the main thread to send requests to the worker, but also to allow a worker to make requests to the main thread. This is supported by Monaco workers, but not by the abstraction layer I use: monaco-worker-manager. So that would need to be implemented first.