fix ollama_api to add llava support

[EvensXia]

Features
fix ollama_api to add llava support

• support llava calling in ollama
• fix typehints and API calling in metagpt/provider/general_api_requestor.py
• remove conflict overload typehints in metagpt/provider/general_api_base.py

This PR fixes #1539

[geekan]

Great! Let’s take a look.

[EvensXia]

• run in examples/llm_vision.py
  
• test in tests/metagpt/provider/test_ollama_api.py
  

[geekan]

Although it seems that the test case does not meet the submission requirements, I think a quick submission can be made first. You can add test cases later.