Fix Gemini instrumentation

[farrelmahaztra]

Note

Expands auto-instrumentation beyond httpx to also cover aiohttp, ensuring trace and auth headers are injected for HUD endpoints.

• Adds _patch_aiohttp that monkey-patches aiohttp.ClientSession with a TraceConfig.on_request_start hook to inject trace headers and Authorization for HUD URLs
• Refactors httpx instrumentation to _instrument_httpx_client and retains auto-patching of httpx clients
• Auto-patches both libraries on module import; updates __all__; minor typing improvements (TYPE_CHECKING, SimpleNamespace)

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