No execution context in Script exception in a synchronous process

**Is your feature request related to a problem? Please describe.**
Yes: I start a trivial process with a single synchronous script task that contains a syntax error using
`_processEngine.getRuntimeService().startProcessInstanceByKey(...)`

The call triggers a
FlowableException { cause: ScriptException{cause: MultipleCompilationErrorException{...}}}

None of the exceptions in the stack trace have a reference to the execution that failed, so I cannot provide context for the error.

**Describe the solution you'd like**

It would be useful to have enough information in the exception stack to identify the execution that failed, as well as the task where the error originated.