Port ox contact invites

[kulmann]

Description

Ports the OX contact invite. Screenshots attached.
Works like this:

• if OX capabilities are set, searching for a share recipient also searches on the OX addressbook API with autocomplete enabled
• OX addressbook results are added to the autocomplete dropdown with a virtual share type contact (100)
• contact shares are not created as people or group shares, but as read only public links with all the default features (e.g. enforced passwords lead to generating a password automatically)
• contacts receive an email that a file or folder has been shared with them
• public links for contacts are created with link name = contact email to easily identify them in the list of links (see screenshot)

Refs

Also needs opencloud-eu/reva#665 and opencloud-eu/opencloud#2898

How Has This Been Tested?

• manual with mock data
• unit tests

Types of changes

• Bugfix
• Enhancement (a change that doesn't break existing code or deployments)
• Breaking change (a modification that affects current functionality)
• Technical debt (addressing code that needs refactoring or improvements)
• Tests (adding or improving tests)
• Documentation (updates or additions to documentation)
• Maintenance (like dependency updates or tooling adjustments)