NIFI-8080: Compile Jython scripts before evaluating

[mattyb149]

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Description of PR

Apply the performance improvement from ScriptedTransformRecord to JythonScriptEngineConfigurator (compile script first).
After running the (currently) ignored added unit test, I noticed up to a 10x performance improvement in ExecuteScript.

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[MikeThomsen]

+1 LGTM and passes tests.

[markap14]

Previously, the init() method evaluated the script. Which means that if the script doesn't compile, the processor would be invalid. Now, with the init() method not compiling the script, does that mean that the processor will be valid even if the script is not compilable? Might make sense to compile in the init() method instead of the first iteration of eval?