Fail task upon function execution error

[RickardCardell]

Maybe this behaviour should be configurable, but this will at least not swallow any function execution error that occurs.

Based on aws doc

Fixes #35

Sample log output upon function exeution error:

connect_1          | [2020-05-29 09:30:46,649] ERROR WorkerSinkTask{id=example-lambda-connector-0} Task threw an uncaught and unrecoverable exception. Task is being killed and will not recover until manually restarted. (org.apache.kafka.connect.runtime.WorkerSinkTask)
connect_1          | com.nordstrom.kafka.connect.lambda.LambdaSinkTask$FunctionExecutionException: Lambda function execution failed. Reason: Unhandled: {"errorMessage": "SDSADSDDS", "errorType": "ValueError", "stackTrace": ["  File \"/var/task/lambda_function.py\", line 5, in lambda_handler\n    raise ValueError(\"SDSADSDDS\")\n"]}
connect_1          | 	at com.nordstrom.kafka.connect.lambda.LambdaSinkTask.handleResponse(LambdaSinkTask.java:215)
connect_1          | 	at com.nordstrom.kafka.connect.lambda.LambdaSinkTask.invoke(LambdaSinkTask.java:199)
connect_1          | 	at com.nordstrom.kafka.connect.lambda.LambdaSinkTask.put(LambdaSinkTask.java:86)
connect_1          | 	at org.apache.kafka.connect.runtime.WorkerSinkTask.deliverMessages(WorkerSinkTask.java:538)
connect_1          | 	at org.apache.kafka.connect.runtime.WorkerSinkTask.poll(WorkerSinkTask.java:321)
connect_1          | 	at org.apache.kafka.connect.runtime.WorkerSinkTask.iteration(WorkerSinkTask.java:224)
connect_1          | 	at org.apache.kafka.connect.runtime.WorkerSinkTask.execute(WorkerSinkTask.java:192)
connect_1          | 	at org.apache.kafka.connect.runtime.WorkerTask.doRun(WorkerTask.java:177)
connect_1          | 	at org.apache.kafka.connect.runtime.WorkerTask.run(WorkerTask.java:227)
connect_1          | 	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
connect_1          | 	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
connect_1          | 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
connect_1          | 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
connect_1          | 	at java.lang.Thread.run(Thread.java:748)