src/vs/workbench/api/browser/mainThreadTunnelService.ts/MainThreadTunnelService/$registerPortsAttributesProvider
class MainThreadTunnelService:	async $registerPortsAttributesProvider(selector: PortAttributesProviderSelector, providerHandle: number): Promise<void> {
		this.portsAttributesProviders.set(providerHandle, selector);
		if (!this._alreadyRegistered) {
			this.remoteExplorerService.tunnelModel.addAttributesProvider(this);
			this._alreadyRegistered = true;
		}
	}