[FLINK-29011] Add Transformer for Binarizer

[weibozhao]

What is the purpose of the change

Add Transformer of Binarizer in FlinkML.

Brief change log

• Add Binarizer (Java & Python)
• Add unit test for Binarizer (Java & Python)
• Add example code for Binarizer (Java&Python)

Does this pull request potentially affect one of the following parts:

Dependencies (does it add or upgrade a dependency): (no) The public API, i.e., is any changed class annotated with @public(Evolving): (no) Does this pull request introduce a new feature? (no) If yes, how is the feature documented? (Java doc)