Add DBW log analysis and visualization

[aduwahi]

Summary
Adds a Python tool for analyzing DBW CSV logs and generating diagonstic visualizations and reports.
Features

• Parses DBW CSV logs while handling the metadata line before the CSV header.
• Generates plots for:
• • desired vs. current steering angle
• • mapped steering and throttle/brake inputs
• • desired speed
• • throttle PWM output
• • safety and mode states
• Generates a summary containing:
• • sample count and log duration
• • maximum desired speed
• • desired and current steering ranges
• • operator E-stop signal values and transitions
• • drive mode and operator mode transitions
• Generates warnings for:
• • constant measured speed
• • nonzero desired speed while the mapped throttle/brake input is near neutral
• • throttle PWM being active while braking
• Removes stale generated report files before producing a new report.
• Adds generated report and local sample-log directories to .gitignore.
  Testing
  Verified with:
  py -3.12 -m py_compile tools\dbw_log_analyzer.py
  py -3.12 -m unittest tests_python.test_dbw_log_analyzer -v
  git diff --check
  All 4 unit tests pass.
  The analyzer was also tested against real DBW CSV logs and successfully generated the expected plot, warning report, and summary.