Related to #766

Add support for multiple monitors and provide screenshots of the visualization containing more than one monitor.

• openadapt/utils.py

  • Update take_screenshot function to iterate through all monitors and capture screenshots.
  • Add a new function take_screenshots to return a list of screenshots from all monitors.

• openadapt/visualize.py

  • Modify main function to handle and display screenshots from multiple monitors.
  • Update the HTML generation logic to include screenshots from all monitors.

• openadapt/record.py

  • Update read_screen_events function to support capturing screenshots from multiple monitors.

• tests/openadapt/test_utils.py

  • Add unit tests for the new take_screenshots function.

/claim #766