feat: surface request parameters in trace detail metadata

[heiwen]

Add a "Request Parameters" section to the Metadata tab in the trace detail view, surfacing gen_ai.request.* span attributes (stream, temperature, max_tokens, top_p, frequency_penalty, presence_penalty, stop_sequences, seed, service_tier).

Closes #423

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[heiwen]

@claude rebase to main

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Claude finished @heiwen's task in 15s —— View job

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