spark native expressions wrapping java implementation of s2geometry library

project structure and spark infrastructure code is being borrowed heavily from:

• apache/incubator-sedona
• yaooqinn/itachi
• mrpowers/bebe

Thank you for your work.

To call the function registrator from pyspark to use functions in SQL: spark._jvm.com.google.common.geometry.spark.S2GeometryFunctionRegistration.registerFunctions(spark._jsparkSession)