Improve error message when filter class is not imported

Author: ismail1432

src/Annotation/ApiFilter.php

@@ -58,7 +58,7 @@ public function __construct($options = [])
         }
 
         if (!is_a($options['value'], FilterInterface::class, true)) {
-            throw new InvalidArgumentException(sprintf('The filter class "%s" does not implement "%s".', $options['value'], FilterInterface::class));
+            throw new InvalidArgumentException(sprintf('The filter class "%s" does not implement "%s". Did you forget a use statement?', $options['value'], FilterInterface::class));
         }
 
         $this->filterClass = $options['value'];

tests/Annotation/ApiFilterTest.php

@@ -34,7 +34,7 @@ public function testInvalidConstructor()
     public function testInvalidFilter()
     {
         $this->expectException(\InvalidArgumentException::class);
-        $this->expectExceptionMessage('The filter class "ApiPlatform\\Core\\Tests\\Fixtures\\TestBundle\\Entity\\Dummy" does not implement "ApiPlatform\\Core\\Api\\FilterInterface".');
+        $this->expectExceptionMessage('The filter class "ApiPlatform\\Core\\Tests\\Fixtures\\TestBundle\\Entity\\Dummy" does not implement "ApiPlatform\\Core\\Api\\FilterInterface". Did you forget a use statement?');
 
         new ApiFilter(['value' => Dummy::class]);
     }