CPE worker threads should inherit TCCL from control thread

[reckart]

Is your feature request related to a problem? Please describe.
When processing data in a CPE, the CPE starts various worker threads. These threads do not inherit the TCCL of the thread from which the processing was started. That means the worker threads may not be able to access essential resources/classes.

Describe the solution you'd like
It would be good if the worker threads inherited the TCCL from the control thread.

Describe alternatives you've considered
Add option to explicitly set a classloader to be injected to the worker threads.

Please complete the following information:

• Version: 3.4.0