A new example application to OmAgent

[Xxxxxsun]

I have reproduced the COT algorithm using OmAgent and reorganized the entire codebase to align with the structure outlined in CONTRIBUTING.md(New Features, Sec. 2). The current directory structure for COT is as follows:

examples/cotprompt
├── agent
│   └── cot_agent
│       ├── cot_conclude.py
│       ├── cot_input_interface.py
│       ├── cot_reasoning.py
│       └── __init__.py
│       
├── compile_container.py
├── configs
│   ├── llms
│   │   ├── gpt4o.yml
│   │   ├── json_res.yml
│   │   └── text_res.yml
│   ├── tools
│   │   └── all_tools.yml
│   └── workers
│       ├── cot_conclude.yml
│       ├── cot_input_interface.yml
│       └── cot_reasoning.yaml
├── container.yaml
└── run_cli.py

The main approach involves implementing three workers:

1. cot_input_interface: Responsible for receiving user questions.
2. cot_reasoning: Dedicated to generating the reasoning path without producing the final answer.
3. cot_conclude: Takes the user question and the reasoning path generated by the ReasonWorker to produce the final answer.