Add flowdrop_workflow_executor module infrastructure
>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3571278. --> Reported by: [joevagyok](https://www.drupal.org/user/2876343) >>> <h3>Summary</h3> <p>Add the <code>flowdrop_workflow_executor</code> module that provides infrastructure for executing FlowDrop workflows from within other workflows. This module bundles the Workflow Executor node, Results Retriever node, execution service, and queue worker.</p> <h3>Module Dependencies</h3> <ul> <li><code>flowdrop:flowdrop</code> - Core FlowDrop module</li> <li><code>flowdrop:flowdrop_workflow</code> - Workflow entity support</li> <li><code>flowdrop:flowdrop_playground</code> - Session-based execution</li> </ul> <h3>Provided Services</h3> <ul> <li><code>flowdrop_workflow_executor.service</code>: Main workflow execution service</li> </ul> <h3>Provided Plugins</h3> <ul> <li><code>flowdrop_workflow_executor:workflow_executor</code>: Execute child workflows</li> <li><code>flowdrop_workflow_executor:workflow_results_retriever</code>: Retrieve async results</li> </ul> <h3>Queue Workers</h3> <ul> <li><code>workflow_executor_queue</code>: Process fire-and-forget executions</li> </ul> <h3>Configuration Entities</h3> <p>Includes node type configurations for both processors with appropriate parameter and output configurations.</p>
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