[python] Speed up LeRobot video window reads - #9852
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Purpose
Speed up overlapping LeRobot video windows by decoding sorted unique frame requests once per payload, then gathering independent, contiguous outputs. Preserve fallback handling for cross-file windows and decoders without batch support.
Validation
89 tests and Flake8 passed; real-video uint8/float32 pixels and mutation isolation verified. Tests assert one decoder call per payload.
CPU overlap benchmark: 37.5 ms for the original unique-frame/stack path, 154.7 ms for the previous PR head, 23.4 ms after this fix (7-run medians). Random 4-camera throughput decreased from 177.9 to 165.1 samples/s versus the previous PR head (3-run medians, controls run earlier). Kept draft while evaluating this tradeoff.