Feature/kb/worker

[gourab-aiplanet]

Example: 
researcher = Worker(
        role="Research Analyst",
        instructions="""
            Uncover cutting-edge developments in AI and data science. You work at a leading tech think tank. Your expertise lies in identifying emerging trends. 
            You have a knack for dissecting complex data and presenting actionable insights. Always utilize the knowledge base available to you first before conducting 
            any new research. Ensure that any information gathered is cross-referenced with the knowledge base for accuracy and completeness.
            """
    )

    # Initialize and load knowledge
    researcher.load_knowledge_from_source(data_source=DataSource(
        type=DataType.PDF,
        url="/Users/gourabsinha/Desktop/AiPlanet/codebase/openagi/example/Generative AI in Research_ Cornell Task Force Report-Dec2023.pdf",
        ),
       n_results=4
    )

[shreehari-aiplanet]

• Please format all the files with ruff
• Format the imports of the files & remove unused imports using ruff.

[shreehari-aiplanet]

Few files still need to be formatted.

[shreehari-aiplanet]

Below files are not formatted:

• src/openagi/actions/data_source.py
• src/openagi/actions/tools/__init__.py
• src/openagi/actions/data_types.py

Rest looks good to me. You can Squash and Merge after making the above changes.