Ability to add multiple urls to a credentials so can avoid duplicates

[z0xrv]

Why/User Benefit/User Problem

they can avoid duplicates and may free some spaces of storage on Mozilla servers
so you can add the website credential and add the app url like what in bitwarden

Acceptance Criteria (how do I know when I’m done?)

you can be able to add multiple URLs on lockwise without copying the username and password