Allows to use GraalVM JavaScript engine for ZAP scripting.
The engine is named Graal.js, which should be used when manually/programmatically configuring ZAP.
Graal.js engines are automatically closed when the engine and any results produced by it are no longer in use. Scripts that are short lived, such as standalone scripts, should therefore not add or install components into ZAP, because those components will become stale when the engine is closed. For components that are expected to live longer, use the extender script type instead. Extender scripts are expected to manage their lifecycle explicitly via their install and uninstall methods.