[FEAT] Detect all Parallel Multiple Events

[csouchet]

Is your feature request related to a problem? Please describe. Given a bpmn input source, detect all BPMN Parallel Multiple Events.

Describe the solution you'd like Manage all Parallel Multiple Events declared in the bpmn input source

Additional context The final shape rendering of all Parallel Multiple Events won't be done as part of this issue and will be managed later.

BPMN specification

Start Top-level Event

Event Sub-Process Start Event

Intermediate Event

Intermediate Events Attached to an Activity Boundary

⚠️ Check the contribution guidelines for BPMN support