Indent SparkSession builder patterns and update binary_classification_metrics_example.py

This issue addresses the comments in SPARK-15031 and also fix java-linter errors.

• Use multiline format in SparkSession builder patterns.
• Update `binary_classification_metrics_example.py` to use `SparkSession`.
• Fix Java Linter errors (in SPARK-13745, SPARK-15031, and so far)