[GR-10337] Properly implement ConsoleIO in RContext.

...oracle/truffle/r/engine/shell/EmbeddedConsoleHandler.java

...her/src/com/oracle/truffle/r/launcher/ConsoleHandler.java

.../com/oracle/truffle/r/launcher/DefaultConsoleHandler.java

...rc/com/oracle/truffle/r/launcher/JLineConsoleHandler.java

.../src/com/oracle/truffle/r/launcher/RAbstractLauncher.java

...c/com/oracle/truffle/r/launcher/StringConsoleHandler.java

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

...truffle/r/nodes/builtin/fastr/FastRSetConsoleHandler.java

...me/src/com/oracle/truffle/r/runtime/context/RContext.java