Add ordered window elements into example folder (#36575)

* Add an example for OrderedBatchElements.

* Fix lints.

* Skip the test if go is not installed in the runtime.

* Skip tests in windows correctly.

* Fix windows test failure.

* Refactor the code and make it extensible to different states in the future.

* Revert the change on prism_runner.py

* Add bag state as the buffer state type.

* Add value state as buffer state.

* Fix lints

* Fix lints.

* Add TestStream method to generate input source to reduce test flakiness.

* Re-enable a test condition.

Author: shunping

sdks/python/apache_beam/examples/cookbook/ordered_window_elements/__init__.py

@@ -0,0 +1,16 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
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+# The ASF licenses this file to You under the Apache License, Version 2.0
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+# the License.  You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
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+#