Refactor micropub specific things out to a slice

slices/micropub/commands/posts/creation_resolver.rb

@@ -0,0 +1,31 @@
+module Micropub
+  module Commands
+    module Posts
+      class CreationResolver
+        include Deps[
+          "validation.posts.post_contract",
+          "validation.posts.bookmark_contract",
+          "validation.posts.checkin_contract",
+          "validation.posts.book_contract",
+          "commands.posts.create_entry",
+          "commands.posts.create_bookmark",
+          "commands.posts.create_checkin",
+          "commands.posts.create_book_post"
+               ]
+
+        def call(entry_type:)
+          case entry_type
+          in Entities::BookmarkRequest
+            {command: create_bookmark, validation: bookmark_contract}
+          in Entities::CheckinRequest
+            {command: create_checkin, validation: checkin_contract}
+          in Entities::BookRequest
+            {command: create_book_post, validation: book_contract}
+          else
+            {command: create_entry, validation: post_contract}
+          end
+        end
+      end
+    end
+  end
+end