make resolve public to avoid boiler plate code

add resolve to public interface

lib/private/appframework/utility/simplecontainer.php

@@ -77,7 +77,7 @@ class SimpleContainer extends Container implements IContainer {
 	 * @return stdClass
 	 * @throws QueryException if the class could not be found or instantiated
 	 */
-	private function resolve($name) {
+	public function resolve($name) {
 		$baseMsg = 'Could not resolve ' . $name . '!';
 		try {
 			$class = new ReflectionClass($name);

lib/public/icontainer.php

@@ -43,6 +43,16 @@ use Closure;
  */
 interface IContainer {
 
+	/**
+	 * If a parameter is not registered in the container try to instantiate it
+	 * by using reflection to find out how to build the class
+	 * @param string $name the class name to resolve
+	 * @return \stdClass
+	 * @since 8.2.0
+	 * @throws QueryException if the class could not be found or instantiated
+	 */
+	public function resolve($name);
+
 	/**
 	 * Look up a service for a given name in the container.
 	 *