General improvements to postlist and post

app/javascript/interfaces/IPost.ts

@@ -4,6 +4,7 @@ interface IPost {
   description?: string;
   boardId: number;
   postStatusId?: number;
+  commentsCount: number;
   userId: number;
   createdAt: string;
 }

app/javascript/interfaces/json/IPost.ts

@@ -4,6 +4,7 @@ interface IPostJSON {
   description?: string;
   board_id: number;
   post_status_id?: number;
+  comments_count: number;
   user_id: number;
   created_at: string;
 }