* [java] Fixing the buffer semantics.
* Renaming bufferCapacity to bufferRemaining.
* Adding a cast to char* so the pointer arithmetic works on Windows.
1. Enlarge the read buffer size further, so that our code can run even faster. TODO: need apply the similar changes to python some other language bindings.
2. Add coreml_VGG16_ImageNet to the test exclusion set of x86_32. It is not a new model but previously we didn't run the test against x86_32.
* [java] - adding a cuda enabled test.
* Adding --build_java to the windows gpu ci pipeline.
* Removing a stray line from the unit tests that always enabled CUDA for Java.
* 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.
