Add secret parameter to workflow

[wintonzheng]

[!IMPORTANT] Add support for 'secret' parameter type in workflow editor, including UI updates and YAML conversion logic.

• Behavior:
  • Add support for secret parameter type in FlowRenderer.tsx, WorkflowEditor.tsx, WorkflowParameterAddPanel.tsx, WorkflowParameterEditPanel.tsx, and WorkflowParametersPanel.tsx.
  • Update convertToParametersYAML() in FlowRenderer.tsx to handle secret parameters.
  • Modify handleSave() in FlowRenderer.tsx to include secret parameters in the save process.
• UI Components:
  • Add UI elements for secret parameters in WorkflowParameterAddPanel.tsx and WorkflowParameterEditPanel.tsx.
  • Update dropdown in WorkflowParametersPanel.tsx to include secret parameter option.
• Types:
  • Update ParametersState type in FlowRenderer.tsx to include secret parameter structure.
• Utils:
  • Update convertEchoParameters() in workflowEditorUtils.ts to exclude secret parameters from echo conversion.

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