Add support for SQL based queries : Allowing complex group by that is performed at DB layer

[StephenOTT]

datasource = getProcessEngineConfiguration().getDataSource()

Groovy: new Sql(datasource)

[StephenOTT]

Query Types:

1. Active
2. Suspended
3. Duration of Activity Defs Per Def Key/ID: Histo
4. Per Tenant
5. Per Def Key
6. Per Def Id
7. Per Task Type (such as Script)
8. Assigned / Reassigned
9. Specific Usage of Specific Delegates
10. Process Count
11. Process Duration (without the need for a execution listener)
12. Msg Start Counts
13. Timer Start Counts
14. Number of executions per Process Instance Def/key (Histo to view parallel activity)
15. Activity Duration Histo: Per Task Type, Per Key Per Tenant
16. Global Variable Counts
17. Parallel Gateway counts
18. Multi-Instance Counts
19. BPMN Error counts
20. Messages Counts
21. User Tasks
22. Compensations
23. Timers + Timer Defs
24. Incidents
25. Call Activities
26. Messages Waiting for catch
27. Timers Due within a Date Range (Next 15min, Next 1 day, Next 30 days, this year, etc)
28. Boundary Timers
29. Event Sub Processes
30. Timers that match a specific patterns such as short timers (1min as example)

[StephenOTT]

Add query support to iterate over time windows to bring in older data