FastR/Scala InterOp in GraalVM

1. First install GraalVM
2. Then set up the JAVA_HOME
3. Use GraalVM Updater to install FastR: gu -c install org.graalvm.r
4. And finally run Scala examples using sbt run.

Note: The demo uses ggplot2 package for plotting; in FastR, run install.packages("ggplot2") to install it. Compiling all the dependencies takes a bit of time, so feel free to have your coffee while it's getting installed.