feat(scripting): add kotlin script (JSR-223) support

[aivinog1]

I've added a Kotlin Script Support (JSR-223).

Closes #72

[saig0]

Thank you for contributing @aivinog1 🎉

Looks good. Just one commend regarding the Kotlin version.

[aivinog1]

@saig0 I've also updated the README :)

[aivinog1]

@saig0 Hi! Can you review this, please? :)

[saig0]

Thanks @aivinog1. Looks good 🎉

The tests are running. But, when I build the JAR and run the worker then I get the following errors:

2020-11-10 07:38:04.441  WARN 27988 --- [pool-2-thread-2] io.zeebe.client.job.worker               : Worker script-worker failed to handle job with key 2251799813685266 of type script, sending fail command to broker

java.lang.RuntimeException: Failed to evaluate script 'x * 2' (kotlin)
	at io.zeebe.script.ScriptEvaluator.evalWithScriptEngine(ScriptEvaluator.java:60) ~[classes!/:0.8.0-SNAPSHOT]
	at io.zeebe.script.ScriptEvaluator.evaluate(ScriptEvaluator.java:42) ~[classes!/:0.8.0-SNAPSHOT]
	at io.zeebe.script.ScriptJobHandler.handle(ScriptJobHandler.java:59) ~[classes!/:0.8.0-SNAPSHOT]
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
	at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
	at io.zeebe.spring.client.bean.MethodInfo.invoke(MethodInfo.java:31) ~[spring-zeebe-0.25.0.jar!/:0.25.0]
	at io.zeebe.spring.client.config.processor.ZeebeWorkerPostProcessor.lambda$null$1(ZeebeWorkerPostProcessor.java:50) ~[spring-zeebe-0.25.0.jar!/:0.25.0]
	at io.zeebe.client.impl.worker.JobRunnableFactory.executeJob(JobRunnableFactory.java:44) ~[zeebe-client-java-0.25.0.jar!/:0.25.0]
	at io.zeebe.client.impl.worker.JobRunnableFactory.lambda$create$0(JobRunnableFactory.java:39) ~[zeebe-client-java-0.25.0.jar!/:0.25.0]
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) ~[na:na]
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na]
	at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304) ~[na:na]
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na]
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na]
	at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na]
Caused by: javax.script.ScriptException: Unable to initialize repl compiler:
  ERROR Unable to find extension point configuration extensions/compiler.xml (cp:
  null): java.lang.IllegalStateException: Unable to find extension point configuration extensions/compiler.xml (cp:
  null)
	at org.jetbrains.kotlin.cli.common.repl.KotlinJsr223JvmScriptEngineBase.asJsr223EvalResult(KotlinJsr223JvmScriptEngineBase.kt:104) ~[kotlin-compiler-embeddable-1.4.10.jar!/:1.4.10-release-411 (1.4.10)]
	at org.jetbrains.kotlin.cli.common.repl.KotlinJsr223JvmScriptEngineBase.compileAndEval(KotlinJsr223JvmScriptEngineBase.kt:63) ~[kotlin-compiler-embeddable-1.4.10.jar!/:1.4.10-release-411 (1.4.10)]
	at kotlin.script.experimental.jvmhost.jsr223.KotlinJsr223ScriptEngineImpl.compileAndEval(KotlinJsr223ScriptEngineImpl.kt:94) ~[kotlin-scripting-jvm-host-1.4.10.jar!/:1.4.10-release-411 (1.4.10)]
	at org.jetbrains.kotlin.cli.common.repl.KotlinJsr223JvmScriptEngineBase.eval(KotlinJsr223JvmScriptEngineBase.kt:31) ~[kotlin-compiler-embeddable-1.4.10.jar!/:1.4.10-release-411 (1.4.10)]
	at io.zeebe.script.ScriptEvaluator.eval(ScriptEvaluator.java:71) ~[classes!/:0.8.0-SNAPSHOT]
	at io.zeebe.script.ScriptEvaluator.evalWithScriptEngine(ScriptEvaluator.java:56) ~[classes!/:0.8.0-SNAPSHOT]
	... 16 common frames omitted

Does this work for you?

[aivinog1]

@saig0 Oops, I've tested running a Spring Boot App via IDEA 😅. I've pushed changes that fixing it.

[saig0]

Works nicely now 🎉
Thanks @aivinog1. I'll trigger a new release for it 🚀