Support the resources/subscribe method

Is your feature request related to a problem? Please describe.

I would like to notify clients of updates to resources to which they've subscribed. Currently it appears the SDK does not handle the resources/subscribe request method.

Describe the solution you'd like

I would like the SDK to handle this method.

Describe alternatives you've considered

Right now I can call sendResourceUpdated which is defined as:

    async sendResourceUpdated(params) {
        return this.notification({
            method: "notifications/resources/updated",
            params,
        });
    }

It doesn't determine whether the client has subscribed to the particular resource or not. I would prefer that the SDK not send the notification to clients which have not subscribed.

Another alternative is to step outside the SDK 🤷‍♂️

Additional context

I'm unaware of popular clients (other than the inspector) which support subscriptions, but they will exist eventually.