chore: Adjust main thread blocking mode

Author: jeromelaban

src/Uno.Wasm.Bootstrap/ts/Uno/WebAssembly/Bootstrapper.ts

@@ -104,6 +104,13 @@ namespace Uno.WebAssembly.Bootstrap {
 					.withRuntimeOptions(config.config.uno_runtime_options)
 					.withConfig({ loadAllSatelliteResources: config.config.uno_load_all_satellite_resources });
 
+				var features = config.config.environmentVariables['UNO_BOOTSTRAP_MONO_RUNTIME_FEATURES'];
+
+				if (features && features.includes('threads')) {
+				//	m.dotnet
+				//		.withConfig({ jsThreadBlockingMode: "DangerousAllowBlockingWait" });
+				}
+
 				const dotnetRuntime = await m.default(
 					(context: DotnetPublicAPI) => {
 						bootstrapper.configure(context);