Added Graphql

tests/assets/graphql/complex.graphql

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+# Complex GraphQL schema with multiple features
+
+scalar DateTime
+scalar JSON
+scalar Date
+
+enum Role {
+  USER
+  ADMIN
+  MODERATOR
+}
+
+type User {
+  id: ID!
+  email: String!
+  name: String!
+  role: Role!
+  createdAt: DateTime!
+  posts: [Post!]!
+  profile: Profile
+}
+
+type Profile {
+  id: ID!
+  bio: String
+  avatar: String
+  metadata: JSON
+  user: User!
+}
+
+type Post {
+  id: ID!
+  title: String!
+  slug: String!
+  content: String
+  published: Boolean!
+  publishedAt: Date
+  author: User!
+  tags: [Tag!]!
+}
+
+type Tag {
+  id: ID!
+  name: String!
+  posts: [Post!]!
+}

tests/assets/graphql/custom_scalars.graphql

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+# GraphQL schema with custom scalars
+
+scalar DateTime
+scalar JSON
+scalar Date
+
+type User {
+  id: ID!
+  email: String!
+  createdAt: DateTime!
+  metadata: JSON
+  birthDate: Date
+}

tests/assets/graphql/enums.graphql

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+# GraphQL schema with enums
+
+enum Role {
+  ADMIN
+  USER
+  GUEST
+}
+
+type User {
+  id: ID!
+  email: String!
+  role: Role!
+}

tests/assets/graphql/relations.graphql

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+# GraphQL schema with relationships
+
+type User {
+  id: ID!
+  email: String!
+  name: String!
+  posts: [Post!]!
+}
+
+type Post {
+  id: ID!
+  title: String!
+  content: String
+  published: Boolean!
+  author: User!
+}

tests/assets/graphql/simple.graphql

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+# Simple GraphQL schema for testing basic type parsing
+
+type User {
+  id: ID!
+  email: String!
+  name: String
+  age: Int
+  active: Boolean!
+}