Gracefully handle OutOfMemory errors

- Detect and report java.lang.OutOfMemory errors
- Fixes #1959
- Use -XX:+HeapDumpOnOutOfMemoryError & -XX:HeapDumpPath to generate a
  heap dump whose existence can notify the client that an OutOfMemory
  error has occured
- Use chokidar library to listen for heap dump files
- Once OutOfMemory error is detected, clean up the heap dumps (only if
  extension configured the location), and offer to increase JVM XmX
  value

Signed-off-by: Roland Grunberg <[email protected]>

Author: rgrunber