Configures an inner bean
('org.springframework.integration.scripting.jsr223.ScriptExecutingMessageProcessor')
that will generate a JSR 223 compliant script.
The script language or JSR 223 scripting engine name. Required only for inline scripts.
If a script location is referenced, the language may be derived from the file extension
(.rb: ruby, .groovy, js: javascript (ECMAScript), .py: python).
The script variable to return as a result of the evaluation (Optional).