Improve Logging, Shadow DOM support, and more

[mdmintz]

Improve Logging, Shadow DOM support, and more

• Improve logging:
  -- Include details about the browser and driver versions in logs.
  -- Also includes some code refactoring.
• Improve Shadow DOM support:
  -- The timing of Shadow DOM methods has been optimized.
• Add a shorter name for highlight_update_text(selector, text):
  -- highlight_type(selector, text)
• Update the flake8 style guide rules for SeleniumBase:
  -- Only ignore rule W503 (line break before binary operator).