check if bean of type ResourceLoader exists (#906)

* check if bean of type ResourceLoader exists

Core upate to test 4.1.0 fails with:

```
io.micronaut.context.exceptions.NoSuchBeanException: No bean of type [io.micronaut.core.io.ResourceLoader] exists. Make sure the bean is not disabled by bean requirements (enable trace logging for 'io.micronaut.context.condition' to check) and if the bean is enabled then ensure the class is declared a bean and annotation processing is enabled (for Java and Kotlin the 'micronaut-inject-java' dependency should be configured as an annotation processor).
	at io.micronaut.context.DefaultBeanContext.newNoSuchBeanException(DefaultBeanContext.java:2773)
	at io.micronaut.context.DefaultApplicationContext.newNoSuchBeanException(DefaultApplicationContext.java:304)
	at io.micronaut.context.DefaultBeanContext.resolveBeanRegistration(DefaultBeanContext.java:2735)
	at io.micronaut.context.DefaultBeanContext.getBean(DefaultBeanContext.java:1729)
	at io.micronaut.context.DefaultBeanContext.getBean(DefaultBeanContext.java:856)
	at io.micronaut.context.DefaultBeanContext.getBean(DefaultBeanContext.java:848)
	at io.micronaut.test.support.sql.TestSqlAnnotationHandler.handle(TestSqlAnnotationHandler.java:66)
	at io.micronaut.test.extensions.AbstractMicronautExtension.afterTestMethod(AbstractMicronautExtension.java:232)
	at io.micronaut.test.extensions.spock.MicronautSpockExtension.lambda$visitSpecAnnotation$0(MicronautSpockExtension.java:85)
	at org.spockframework.runtime.extension.MethodInvocation.proceed(MethodInvocation.java:101)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
	at org.spockframework.runtime.model.MethodInfo.invoke(MethodInfo.java:156)
```

* Extract method to reduce nesting

---------

Co-authored-by: Tim Yates <[email protected]>

test-core/src/main/java/io/micronaut/test/support/sql/TestSqlAnnotationHandler.java

@@ -31,7 +31,6 @@
 import java.io.InputStream;
 import java.net.URL;
 import java.nio.charset.StandardCharsets;
-import java.sql.SQLException;
 import java.util.Arrays;
 import java.util.List;
 import java.util.Optional;
@@ -59,10 +58,19 @@ private TestSqlAnnotationHandler() {
      * @param applicationContext The application context
      * @param phase The {@link Sql.Phase} to run the scripts in
      *
-     * @throws SQLException If an error occurs executing the SQL
      * @throws IOException If an error occurs reading the SQL
      */
     public static void handle(BeanDefinition<?> specDefinition, ApplicationContext applicationContext, Sql.Phase phase) throws IOException {
+        if  (applicationContext.containsBean(ResourceLoader.class)) {
+            doHandle(specDefinition, applicationContext, phase);
+        } else {
+            if (LOG.isTraceEnabled()) {
+                LOG.trace("No bean of type ResourceLoader exists. You cannot use the @Sql annotation");
+            }
+        }
+    }
+
+    private static void doHandle(BeanDefinition<?> specDefinition, ApplicationContext applicationContext, Sql.Phase phase) throws IOException {
         ResourceLoader resourceLoader = applicationContext.getBean(ResourceLoader.class);
         Optional<List<AnnotationValue<Sql>>> sqlAnnotations = specDefinition
             .findAnnotation(Sql.Sqls.class)