[GR-4163] Create a node for the conversion between Java and R values.

...fle.r.engine/src/com/oracle/truffle/r/engine/REngine.java

.../com/oracle/truffle/r/nodes/builtin/base/BasePackage.java

...om/oracle/truffle/r/nodes/builtin/fastr/FastRInterop.java

...acle/truffle/r/nodes/access/vector/ExtractVectorNode.java

...acle/truffle/r/nodes/access/vector/ReplaceVectorNode.java

...es/src/com/oracle/truffle/r/nodes/function/RCallNode.java

....r.runtime/src/com/oracle/truffle/r/runtime/RRuntime.java

...e.r.runtime/src/com/oracle/truffle/r/runtime/RSource.java

...e/src/com/oracle/truffle/r/runtime/interop/Foreign2R.java

.../com/oracle/truffle/r/runtime/interop/ForeignArray2R.java

...e/src/com/oracle/truffle/r/runtime/interop/R2Foreign.java

...est/src/com/oracle/truffle/r/test/ExpectedTestOutput.test

.../oracle/truffle/r/test/library/fastr/TestJavaInterop.java