Fix the duplicated import with multiple same association

This commit fixes the case where duplicated types are generated
(which causes error) with more than one association with the
same resource option.

lib/typelizer/interface.rb

@@ -66,7 +66,7 @@ def imports
         .uniq
         .reject { |type| global_type?(type) }
 
-      custom_type_imports + serializer_types
+      (custom_type_imports + serializer_types).uniq
     end
 
     def inspect

spec/__snapshots__/AlbaUser.ts.snap

@@ -1,4 +1,4 @@
-// Typelizer digest 26603b722342e08a183535283afd6418
+// Typelizer digest 9639758a07e00e4992619fbdef2450db
 //
 // DO NOT MODIFY: This file was automatically generated by Typelizer.
 import type {AlbaPost} from '@/types'
@@ -9,6 +9,7 @@ type AlbaUser = {
   active: boolean;
   invitor: AlbaUser;
   posts: Array<AlbaPost>;
+  latest_post: AlbaPost;
 }
 
 export default AlbaUser;

spec/__snapshots__/AlbaUserSerializerFoo.ts.snap

@@ -1,4 +1,4 @@
-// Typelizer digest 859bc62cd130d27f4d44be0fdf719c90
+// Typelizer digest c6fb5013c54f52cedcbedeaef1455ff1
 //
 // DO NOT MODIFY: This file was automatically generated by Typelizer.
 import type {AlbaUser, AlbaPost} from '@/types'
@@ -9,6 +9,7 @@ type AlbaUserSerializerFoo = {
   active: boolean;
   invitor: AlbaUser;
   posts: Array<AlbaPost>;
+  latest_post: AlbaPost;
   created_at: string;
 }
 

spec/app/app/serializers/alba/user_serializer.rb

@@ -6,6 +6,7 @@ class UserSerializer < BaseSerializer
     has_one :invitor, resource: UserSerializer
 
     has_many :posts, resource: PostSerializer
+    has_one :latest_post, resource: PostSerializer # Duplicated association
 
     class FooSerializer < UserSerializer
       typelize_from ::User