onnxruntime

[Java] Adding missing methods on Session, SessionOptions and RunOptions (v2) (#3832)

* java - adding support for custom op libraries.

* Adding support for RunOptions and additional methods for SessionOptions and OrtSession.

As a result OrtEnvironment.LoggingLevel moved to be a top level enum
called OrtLoggingLevel.

* java - adding unit tests for RunOptions and SessionOptions.

* java - removing unused releaseNamesHandle method

* java - add test for custom op library.

* java - adding log verbosity methods, and tests for the same.

* java - fixes for custom op loading test on Windows.

* Cleanup after rebase on master.