Rohan Mehta 68c800d2a3 [2/n] Add MCP support to Runner ...

### Summary:
This enables users to **use** MCP inside the SDK.
1. You add a list of MCP servers to `Agent`, via `mcp_server=[...]`
2. When an agent runs, we look up its MCP tools and add them to the list of tools.
3. When a tool call occurs, we call the relevant MCP server.

Notes:
1. There's some refactoring to make sure we send the full list of tools to the Runner/Model etc.
2. Right now, you could have a locally defined tool that conflicts with an MCP defined tool. I didn't add errors for that, will do in a followup.

### Test Plan:
See unit tests. Also has an end to end example next PR.

2025-03-24 15:08:02 -04:00

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