Use API v2 in web client

[RomainMaillot]

• Use v2 of API instead of v1
• Scanners are link to v2/scanners
• Propose to run scanner only if dryrun worked and number is valid
• Display json viewer for all scanners

[sundowndev]

Thanks a lot for your contribution 👍🏻

That's good work overall, I left some comments, I also have a few change requests found when testing the UI manually:

• web/client/package-lock.json shouldn't exist since we're using yarn. Please run yarn to update yarn-lock.json as well
• when user enters an invalid number, it does nothing. It should show information only