Add identity tag which just returns whatever was entered as input

lib/chili_project/liquid/tags/identity.rb

+module ChiliProject::Liquid::Tags
+  class Identity < Tag
+    def initialize(tag_name, markup, tokens)
+      @tag_name = tag_name
+      @markup = markup
+      @tokens = tokens
+      super
+    end
+
+    def render(context)
+      "{% #{@tag_name} %}"
+    end
+  end
+end
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