OPAL-2573 Async R operations handling added.
OPAL-2573 RCommand Dto and resources added.
OPAL-2573 Allow async assignement.
OPAL-2573 Allow waiting for command to end when querying for result
OPAL-2573 Support for asynchronous datashield queries.
OPAL-2570 - add the UI to add R Options
OPAL-2570 - saved the options in the current R Session