cuvs-java: Refactor method handle usage and separate out local areas from long held

[ChrisHegarty]

This change refactors the native downcall method handles so that they are static final constants - which optimise better by the JVM. It's also the generally accepted pattern, where the handles are tied to the lifetime of class which effectively mediates access - by virtue of reachability.

Additionally,

1. the error codes from native calls are plumbed in and checked.
2. a state is added to any classes that hold a reference to native resources that could be released.
3. a local arena is used for memory allocation only needed per downcall invocation, e.g. the return value.

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[cjnolet]

/ok to test