Add Generic Parser Strategy for List Format

[aep7128]

Generic Parser design here: https://app.diagrams.net/#G1ZhVaJu0XKpyKtDhr2uqTQVVWg-X07XC1

Generic Parser will use this strategy if it finds a source with an list layout
(ex. UiPath Security Advisories & Bulletins)

[aep7128]

More info on this use case here: https://docs.google.com/spreadsheets/d/1MHsXLgoQIi4hQg4aM6Q23XBEUulTRReZlxNw4vpeS70/edit#gid=517593048