Implement a default script worker in the adapter

[jonathanlukas]

Is your feature request related to a problem? Please describe.

Script tasks were automated using engine-internal scripting.

Beside only supporting FEEL, Zeebe currently does not have the capabilities to execute script tasks using inline or referenced scripts.

However, the converter prepares a script task to be executed like a service task, using a special job type and headers that describe the scriptFormat, script or scriptResource.

Describe the solution you'd like

On booting the adapter, a script worker will come up that is implemented exactly against the converted script task.

The script worker can be taken from here: https://github.com/camunda-community-hub/zeebe-script-worker

Given all scripting engines that were registered to the process application are still there, we should be able to execute the scripts like before.

Describe alternatives you've considered

There is a script worker project in the community hub as well, maybe this one could be re-used

Additional context

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