Bulk Export/Import of Workflow Definitions

[sfmskywalker]

This PR updates the Workflow Definitions List view to add bulk export/import functionality.

=== auto-pr-body ===

Summary: This Pull Request introduces new functionality such as the ability to delete workflows, added new event handlers, adding parameters, and import new libraries.

List of Changes:

• Changed event handler type for MudSwitch component from CheckedChanged to @OnAutoSaveChanged.
• Changed event handler type for MudFileUpload from FilesChanged to @OnFileSelected.
• Changed event handler type for MudIconButton inside MudButtonGroup from OnClick to @OnPublishClicked.
• Changed event handler type for MudIconButton inside MudButtonGroup from OnClick to @OnRetractClicked.
• Changed event handler type for MudMenuItem inside MudButtonGroup from OnClick to @OnDownloadClicked.
• Changed event handler type for MudMenuItem inside MudButtonGroup from OnClick to @OnUploadClicked.
• Changed event handler type for MudIconButton from OnClick to @OnRunWorkflowClicked.
• Changed event handler type for ActivityPropertiesPanel component from OnActivityUpdated to @OnSelectedActivityUpdated.
• Added <MudFileUpload T="IReadOnlyList<IBrowserFile>" FilesChanged="@OnFilesSelected"/> component.
• Added new MudMenuItem to enable users to delete workflows
• Added OnBulkExportClicked event handler
• Added OnImportClicked event handler
• Added OnFilesSelected event handler
• Added new MudButtonGroup containing both a Create Workflow button and an Import button
• Updated WorkflowDefinitionRow to include a new Id parameter
• Imported new libraries, including System.Text.Json, System.Text.Json.Serialization, and Refit

Refactoring Target:

• Replace usage of OnClick with @onClick for all components in the pull request diff for consistency.
• Move the <MudFileUpload T="IReadOnlyList<IBrowserFile>" FilesChanged="@OnFilesSelected"/> component outside Pages/WorkflowDefinitions/List/Index.razor and add it to a separate shared partial or component.
• Consider wrapping redundant code into objects and parameters in order to reduce code duplication.