This pull request integrates AgentOps with the ReAG (Retrieval Augmented Generation) library to enable monitoring and tracing of agent workflows. The changes include:

1. Added AgentOps as an optional dependency in pyproject.toml.
2. Created an init_agentops function in __init__.py to initialize AgentOps.
3. Added AgentOps decorators to the ReagClient class and its methods.
4. Updated the README with instructions on how to use AgentOps with ReAG.
5. Added a new test case to verify AgentOps integration.

These changes allow users to easily integrate AgentOps with their ReAG workflows, providing better insights and monitoring capabilities for their AI applications.