public static Resource.Provider group(Resource.Provider... providers) {
        return group(() -> Arrays.stream(providers));
    }
public static Resource . Provider group ( Resource . Provider ... providers ) { return group ( ( ) -> Arrays . stream ( providers ) ) ; }
Group ResourceProviders together into one resources Resource Provider.
<p>
{@code
Resource.Provider providerA = Kute.directoryProvider(new File("images/"));
Resource.Provider classpathProvider = Kute.getDefaultProvider();
Resource.Provider provider = Kute.group(providerA, classpathProvider);
}

@param providers The resource providers to group.
@return A resource provider that providers resources for all the given resource providers.