Improve tool call by re-trying tool call with the model response content

[briandevvn]

During tool calling, the model sometimes does not call any tools, instead, it returns the string content with the JSON arguments or text that explains what tools are using and the arguments.

This PR takes care of this case by retrying calling tools with the model response content because the response content contains the tool call name and the argument. We can use the model to extract the value from that.

Example:

Output message of the LLM: ─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
ModelResponse(id='chatcmpl-16ff14bb-1aff-427b-8ed8-0ddbc4a65d64', created=1742489273, model='ollama_chat/llama3.1:latest', object='chat.completion', system_fingerprint=None,                       
choices=[Choices(finish_reason='stop', index=0, message=Message(content='[ACTION]:\n```\nFirst action: Visit apple.com\n```python\nvisit_page(url="https://apple.com/")\n```',          
role='assistant', tool_calls=None, function_call=None, provider_specific_fields=None))], usage=Usage(completion_tokens=30, prompt_tokens=2080, total_tokens=2110, completion_tokens_details=None,   
prompt_tokens_details=None))                                                                                                                                                                        
Model did not call any tools. Retrying with the model response content... ──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
[ACTION]:                                                                                                                                                                                                                                                                                                                                                                                      
First action: Visit apple.com                                                                                                                                                                 
python                                                                                                                                                                                           
visit_page(url="https://apple.com/")                                                                                                                                                          
                                                                                                                                                                                                 
╭──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
│ Calling tool: 'visit_page' with arguments: {'url': 'https://apple.com/'}                                                                                                                   │
╰──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
                                                                                                                                

[hongquan]

You can write:

if (model_message.content.strip() != '') and not model_message.tool_calls:
    ...

The not model_message.tool_calls covers both None and empty list cases.

You should strip content to cover the case that content has some data but only whitespaces.

[hongquan]

Catch a concrete exception class, not general Exception class.