[Clojure] Port ResourceScope to the Clojure Package

[gigasquid]

It would be nice to port ResourceScope to the Clojure package to have a standard way to manage memory among the JVM languages

https://github.com/apache/incubator-mxnet/blob/master/scala-package/core/src/main/scala/org/apache/mxnet/ResourceScope.scala

Completing this would involving the correct interop to call the functions and use it in an idiomatic Clojure way. It would also involve creating unit tests along the lines of https://github.com/apache/incubator-mxnet/blob/master/scala-package/core/src/test/scala/org/apache/mxnet/ResourceScopeSuite.scala

@nswamy Is available as a resource from the Scala package side to provide an overview / insight on the design and limitations

[gigasquid]

working on this one

[gigasquid]

merged!