feat: Adds in the @required Relay directive

Adds in the `@required` directive outlined at https://github.com/facebook/relay/blob/452ec63a3f047898d9326b6b8be612071a8ffbbc/packages/relay-compiler/transforms/RequiredFieldTransform.js#L58-L67

Author: maraisr

resources/META-INF/relay modern directives schema.graphql

@@ -61,3 +61,14 @@ directive @stream(
 ) on FIELD
 
 directive @preloadable on QUERY
+
+enum RequiredFieldAction {
+    NONE
+    LOG
+    THROW
+}
+
+directive @required(
+    action: RequiredFieldAction!
+) on FIELD
+