Implement a common testing framework for Transport UDFs

[shardulm94]

• Add transportable-udfs-test-spi containg the SPI to be implemented by the testers. Also contains an extended SPI for SQL-specific testers
• Add transportable-udfs-test-api which contains the user facing API for the test framework
• Add Hive, Presto, Spark and generic implementations for the transportable-udfs-test-spi. For every platform
  • Add a TestStdUDFWrapper which takes in classes enclosed by the wrapper as constructor arguments
  • Add an implementation of StdTester for that platform
  • For SQL-based testers add a SqlFunctionCallGenerator to generate a SQL string from user input arguments
  • For SQL-based testers add a ToPlatformTestOutputConverter to convert user-provided expected output data to output received from the platform's SQL query execution
• For the generic tester platform, implement StdData, StdFactory and all classed from transportable-udfs-typesystem
• Add support for unknown data type in Hive, Presto and Spark

[wmoustafa]

Thanks @shardulm94 for this feature!

This patch has been reviewed internally at LinkedIn since the feature started before open sourcing the Transport framework. I will go ahead and merge.