Add hydrate class constant to resource interface

src/FileGenerators/InterfaceGenerator.php

@@ -63,6 +63,19 @@ public function generate(): Node
         $class = $factory->interface($className)
             ->extend('ResourceInterface');
 
+        $class->addStmt(
+            new Node\Stmt\ClassConst(
+                [
+                    new Node\Const_(
+                        'HYDRATE_CLASS',
+                        new Node\Scalar\String_(
+                            $this->yaml['class']
+                        )
+                    )
+                ]
+            )
+        );
+
         foreach ($this->yaml['properties'] as $name => $details) {
             $type = $details;
             if (is_array($details)) {

tests/expected-app/src/Resources/Project/BuildInterface.php

@@ -8,6 +8,8 @@
 
 interface BuildInterface extends ResourceInterface
 {
+    const HYDRATE_CLASS = 'Project\\Build';
+
     /**
      * @return int
      */

tests/expected-app/src/Resources/Project/ConfigInterface.php

@@ -6,6 +6,8 @@
 
 interface ConfigInterface extends ResourceInterface
 {
+    const HYDRATE_CLASS = 'Project\\Config';
+
     /**
      * @return string
      */

tests/expected-app/src/Resources/ProjectInterface.php

@@ -8,6 +8,8 @@
 
 interface ProjectInterface extends ResourceInterface
 {
+    const HYDRATE_CLASS = 'Project';
+
     /**
      * @return int
      */