refactor:adjust the openai and codellama agent

[imotai]

PR-Codex overview

This PR focuses on adding new dependencies, updating existing dependencies, and making code changes related to agent functionality.

Detailed summary

• Added pytest-mock to the requirements.txt file
• Added fastapi and uvicorn to the agent/setup.py file
• Updated versions of grpc-google-iam-v1 and grpcio-tools in the proto/setup.py file
• Added logging changes in the kernel/tests/kernel_client_tests.py file
• Updated shell script in the start_sandbox.sh file
• Made code changes in the agent/tests/agent_api_tests.py file
• Made code changes in the agent/src/og_agent/prompt.py file
• Added new test cases in the agent/tests/openai_agent_tests.py and agent/tests/codellama_agent_tests.py files
• Made code changes in the agent/src/og_agent/base_agent.py file

The following files were skipped due to too many changes: agent/src/og_agent/base_agent.py, proto/src/og_proto/agent_server.proto, sdk/src/og_sdk/agent_sdk.py, agent/src/og_agent/mock_agent.py, chat/tests/test_chat_function.py, agent/src/og_agent/agent_api_server.py, sdk/tests/agent_sdk_tests.py, chat/src/og_terminal/ui_block.py, agent/src/og_agent/agent_server.py, agent/src/og_agent/codellama_agent.py, agent/src/og_agent/openai_agent.py, chat/src/og_terminal/terminal_chat.py

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