perf: speed up Python stack capture#3147
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2.0–2.6× faster Playwright calls under pytest; 1.2–1.7× faster standalone.
This replaces `inspect.stack(0)` with direct `f_back` traversal. It still captures the full stack, but avoids eagerly constructing `FrameInfo` objects and inspecting source context on every API call.
Paired `page.evaluate("1")` benchmarks on Python 3.12:
The difference is larger under pytest because its runner stack is deeper.
Re #2836.