Add support for execution listeners

barmac commented 11 months ago

Tracks modeling parts of https://github.com/camunda/product-hub/issues/915.

Description

Support modeling of execution listeners within BPMN models Camunda 8 diagrams:

<zeebe:executionListeners>
  <zeebe:executionListener eventType="start" retries="3" type="start_execution_listener_type"/>
  <zeebe:executionListener eventType="end" retries="5" type="end_execution_listener_type_1"/>
  <zeebe:executionListener eventType="end" retries="2" type="end_execution_listener_type_2"/>
</zeebe:executionListeners>

What should we do?

[x] I can define execution listeners
[x] I can define execution listener eventType (required)[string type] ("start"/"end") - values [start,end], define when the EL should be executed, either before or after the element is processed.
- [x] Tasks (start/end)
- [x] Process (start/end)
- [x] Subprocesses (start/end)
- [x] Events (start/end)
- [x] Gateways (only start)
[x] I can define a job (listener) definition type (required) [string or FEEL expression type] - to subscribe to as a worker
[x] I can define the same properties as for the “usual” job:
- [x] retires(optional, default is 3) [string or FEEL expression type] - defines the number of times a job should be retried if a failure is signaled by a worker.
[x] Duplicate ELs are marked as invalid