fix(mcp): CORS middleware, renaming, error handling

[matthewmcneely]

Description

This PR:

• Adds a CORS middleware handler to the MCP SSE server
• Adds sanity checking for malformed MCP arguments (prevent panics)
• Renames tools, resources and prompts to use the snake_case convention of MCP discussion
• Uses the correct error handling for returning errors to clients
• Adds a comprehensive integration test for the MCP SSE implementation

Note, there's a MCP demo client here that you can spin up to test the SSE implementation.

Checklist

• Code compiles correctly and linting passes locally
• Tests added for new functionality, or regression tests for bug fixes added as applicable

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