Add related posts and products to graphql schema

Author: andriysvyryda

etc/schema.graphqls

@@ -116,6 +116,8 @@ type BlogPost {
     views_count: Int @doc(description: "Blog Post Views count")
     is_recent_posts_skip: Int @doc(description: "Blog Post Is recent posts skip")
     short_content: String @doc(description: "Blog Post Short content")
+    related_posts: [BlogPost] @doc(description: "Blog Related posts")
+    related_products: [ProductInterface] @doc(description: "Blog Related products")
     #fb_auto_publish: Int @doc(description: "Blog Post Fb auto publish")
     #fb_post_format: String @doc(description: "Blog Post Fb post format")
     #fb_published: Int @doc(description: "Blog Post Fb published")