Flowable engine IntelliJ plugin

### **Is your feature request related to a problem? Please describe.**
Hello all, I've started the implementation of IntelliJ plugin for Flowable-engine at
https://github.com/valb3r/flowable-bpmn-intellij-plugin
You can download its MVP version from its release page that allows to navigate between your BPMN diagram and java code of i.e. ServiceTask.

**Describe the solution you'd like**
I would like to ask for feature requests for this plugin (as I don't know what features can be useful in it for others). If someone knows what can be useful for the plugin please raise an issue at https://github.com/valb3r/flowable-bpmn-intellij-plugin/issues
Maybe Flowable engine maintainers could help me with the essential feature list

**Describe alternatives you've considered**
I've tried a multitude of IntelliJ BPMN plugins and they either are useless or can't work with Flowable dialect (also I haven't seen a plugin with BPMN diagram -> code navigation working properly)