Executing workflows dynamically using Java SDK

[saksham2105]

We will dynamically form this JSON based on mediation rules

(Check the input of this Workflow those will be our mediation rules ,based on this .We will dynamically form workflow)

https://events-test.orkesconductor.io/execution/408b97d4-3dfa-11ef-a272-ea44bab73e42

Changes in this PR :

Created Necessary Pojo classes for Mediation Rules

Added a Simple worker to execute an another workflow named dynamic_workflow and pass input to this workflow as WorkflowDef. We generated workflowDefinition using createDynamicSubworkflow() method which is basically a dynamic definition of subworkflow which we want to execute. If you check there is no workflow with definition dynamic_subworkflows_series exist ,since this subworkflow will be executed dynamically without definition. We can added as many steps in createDynamicSubworkflow() as we want and make the dynamic_subworkflows_series dynamic.

Sample executions : https://play.orkes.io/execution/abf1fac4-3a1d-11ef-9236-1aff359c3247

Check this execution and keep on expanding subworkflows in this workflow and the child workflows as well.

Note : I have changed some naming convention, workflow and variable names in code for readability

Screenshot :-

[jmigueprieto]

@saksham2105 - I think that an example of "Executing workflows dynamically using Java SDK" might be great but I'm not sure if this is the place for it.

Also, the subworkflow created in DynamicSubworkflowWorker is too specific and complex for an example.

[jmigueprieto]

This is great but IMHO it's not a good "sample worker".

We should review it and simplify it.