Support upscoping on insufficient_scope 403 like in Python SDK

[dmcwherter]

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Python auth SDK supports upscoping on 403 insufficient scope errors. Typescript does not have this functionality yet. https://github.com/modelcontextprotocol/python-sdk/blob/main/src/mcp/client/auth.py

Describe the solution you'd like

Equivalent functionality to the 403 handling case here:
https://github.com/modelcontextprotocol/python-sdk/blob/main/src/mcp/client/auth.py

Describe alternatives you've considered

None.

Additional context
None