[WIP] Update project to implement round robin quote server mechanism

[Copilot]

• Explore repository structure and understand codebase
• Build and test current state (all tests passing)
• Create quote service interface and implementations for Alpaca, FinnHub, and AlphaVantage
• Implement round-robin manager to switch between providers on failure
• Add API endpoint to expose quote functionality
• Create tests for the round-robin mechanism
• Verify the implementation works correctly

Original prompt

update this project to use a round robin mechanism where the quote server being used is changed dynamically at runtime. By default requests will first go to Alpaca until a non successful status code is received or an exception is hit. When that happens, the next service to try is FinnHub. And similarly if there are issues the next would be AlphaVantage and then Alpaca again.

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