Add New Workflow Nodes to AnsariWorkflow

[abdullah-alnahas]

Implement the new workflow nodes as detailed in the API-v3 documentation, including the following sequences:

• Plan, then Answer
• Plan, Answer, Review, then Refine the Answer
• Answer, Review, then Refine the Answer

Additionally, consider creating a dynamic node that allows for an arbitrary sequence of Plan, Review, and Answer steps. The benefit of having a single workflow item perform multiple agentic steps is that it reduces the cost of input tokens by processing them only once.