Feature/sub process

[konekomind]

Closes #291 , #140

This is kinda a overview of what the code does https://excalidraw.com/#json=z72Pe9EIP7u8iw709O2yp,kZ-ehRANGAjs3lWvhiLBzQ
Changes to batches, locks, parent process continuation https://excalidraw.com/#json=iX94_Bk4_xORKYzrErc_d,babt027VBZ1B8EAxwp6HhQ

[gemini-code-assist]

Summary of Changes

Hello @konekomind, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request delivers a major feature by implementing robust support for BPMN sub-processes and multi-instance activities. It involves a deep overhaul of the process engine's internal workings, from database schema and data models to core execution logic and variable management. The changes ensure that the engine can correctly manage the lifecycle of nested processes and parallel/sequential activity repetitions, significantly expanding its capability to execute intricate BPMN diagrams.

Highlights

• Sub-process and Multi-instance Support: Introduced comprehensive support for BPMN sub-processes and multi-instance activities, allowing for more complex process modeling and execution.
• Flow Element Instance Tracking: Refactored the FlowElementHistory concept into FlowElementInstance, enhancing the tracking of process execution by storing detailed information including execution tokens, input variables, and output variables for each flow element.
• Database Schema Updates: Modified the database schema to support sub-process metadata (parent process definition key, target element ID, and instance key) and the enriched FlowElementInstance data.
• Variable Propagation Enhancements: Improved variable handling mechanisms with new methods like EvaluateAndSetMappingsToLocalVariables and PropagateLocalVariablesToParent, ensuring accurate variable flow between parent and child processes, and within multi-instance contexts.
• Engine Core Refactoring: Undertook significant refactoring of the core engine logic, including how process instances are created, run, and how execution tokens are managed, to seamlessly integrate sub-process and multi-instance execution.

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