"""Processes a list of content lines by inserting extra lines between specified start and end lines.

This function iterates through the content lines and inserts extra lines between the lines that match the specified start and end lines. The extra lines are formatted with a prefix and suffix. Optionally, empty lines can be added around the inserted extra lines.

Args:
    content (List[str]): The original list of content lines to process.
    extras_list (List[str]): The list of extra lines to insert between the start and end lines.
    start_line (str): The line that marks the start of the section where extras should be inserted.
    end_line (str): The line that marks the end of the section where extras should be inserted.
    prefix (str): The prefix to add to each extra line.
    suffix (str): The suffix to add to each extra line.
    add_empty_lines (bool): Whether to add empty lines before and after the inserted extra lines.

Returns:
    List[str]: The processed list of content lines with the extra lines inserted as specified.
"""