Add collaborators management views

[artonge]

Also contains some minor css tweaks.

Screenshots

Collaborator list	With some selection	Without public link during creation

Initial loading	Loading when searching

Public link created	Public link copied

Fix #1226

[jancborchardt]

Looks good, just a few things:

• The "Share link" finction looks oddly placed and not interactive. Maybe better as a secondary button on the bottom left instead?
• The gab below the input field looks off. Wouldn't this work like in Files, where people are picked one by one from the suggestion dropdown?
• Possibly a general Vue component thing, but there should be a close x within the modal on the top right
• Wording in the title subline: "users" to "people", and " group" needs to be plural "groups"

[nimishavijay]

Looks very nice! Agree with everything mentioned, plus a few more points:

• "Save collaborators list" --> "Save" or maybe "Save collaborators"
• Usually the icon associated with "Save" is the checkmark icon. The paper plane icon is usually for send. I'm also wondering if we need an icon at all
• "Share this album via link" --> "Share via public link"? To make it clearer that it's a public link and to make it shorter if it's going to be a button on the bottom left
• We can also add an icon to the "Share via public link" button as when it's clicked it changes into the "Copy link" button which has an icon
• Maybe there can also be a way to unshare in case the "Share via public link" button was clicked by accident. If we are going with the secondary button on the bottom left, then there could possibly be:
  • a trash icon or close icon next to it on the right which would unshare
  • or a 3 dot menu with one item "Unshare"

cc @jancborchardt as well

Addressed

[PVince81]

Reviewed together, looks good 👍

the only critical part I think is the DB schema to remove the cached display name and use the display name cache instead / lazy user

[PVince81]

for retrieving display names, use $this->userManager->getDisplayName($userId) to make sure it hits the cache

[artonge]

/compile amend /