Add range formatting method to the formatter add-on

lib/ruby_lsp/standard/wraps_built_in_lsp_standardizer.rb

@@ -20,6 +20,13 @@ def run_diagnostic(uri, document)
         @standardizer.offenses(uri_to_path(uri), document.source, document.encoding)
       end
 
+      def run_range_formatting(_uri, _partial_source, _base_indentation)
+        # Not yet supported. Should return the formatted version of `partial_source` is a partial selection of the
+        # entire document. For example, it should not try to add a frozen_string_literal magic comment and all style
+        # corrections should start from the `base_indentation`
+        nil
+      end
+
       private
 
       # duplicated from: lib/standard/lsp/routes.rb