Samples: Add benchmark results visualization sample

[csu-bot-zivid]

New sample: visualize_benchmark_results.py

• Turns the CSV output of the ZividBenchmark sample into charts, useful
  for reviewing a single system or comparing several systems and test
  categories.
• Added to the README under "Benchmarking Your System", available under
  source/camera/maintenance/.
• Uses seaborn for its charts (now a listed dependency).

CUDA sample simplification

• capture_and_process_image_with_cupy_on_cuda: wrap the GPU buffer
  with cp.asarray() instead of manually building it from a pointer,
  stride and shape. The sample now also verifies that the resulting
  CuPy array shares the same GPU pointer as Zivid's buffer, confirming
  the zero-copy handoff.

Fixes and docs

• connect: add --serial, --ip, and --hostname options so you can
  point the sample at your own camera from the command line instead of
  editing the source.
• Hand-eye calibration GUI: detect the checkerboard using
  detect_calibration_board instead of detect_feature_points.
• capture_vis_3d_in_loop_with_keypress_exit: simplify the
  keypress/exit handling.
• Shorten and clarify many sample and README descriptions.
• Add descriptive docstrings to several shared helper modules used by
  the samples.