Add BPMN import/export functionality to workflows:

pratyushrequested to merge
develop into main
  • Implement handleImportBpmn and handleExportBpmn methods in WorkflowsPage for managing BPMN files.
  • Add file input and buttons for importing/exporting BPMN diagrams in the UI.
  • Extend workflowService with importFromBpmn and exportToBpmn methods.
  • Update httpClient to handle non-JSON responses.

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