Extend prepare API/docs across bindings

Agent-Logs-Url: https://github.com/microsoft/regorus/sessions/49ba4462-95d3-42c0-a302-db1b81df4f65

Co-authored-by: anakrish <35780660+anakrish@users.noreply.github.com>

bindings/ruby/test/test_regorus.rb

@@ -150,6 +150,7 @@ class TestRegorus < Minitest::Test
   end
 
   def test_engine_cloning
+    @engine.prepare
     cloned_engine = @engine.clone
 
     assert_instance_of ::Regorus::Engine, cloned_engine