feat(NcAvatar): implement custom javascript hook action for the contacts menu

[st3iny]

☑️ Resolves

• Part of: Availability view of other people nextcloud/server#44776
• Server PR: feat(contacts-menu): implement custom javascript hook action nextcloud/server#49375

📒 Description

Adds a new contacts menu that is able to trigger hooks registered via registerContactsMenuAction("foo-bar").

export interface ContactsMenuAction {
	id: string,
	displayName: (entry: ContactsMenuEntry) => string,
	enabled: (entry: ContactsMenuEntry) => boolean,
	iconSvg: (entry: ContactsMenuEntry) => string,
	callback: (entry: ContactsMenuEntry) => void,
}

🖼️ Screenshots

Nothing really to show here. Please have a look here for an implementation.

🏁 Checklist

• ⛑️ Tests are included or are not applicable
• 📘 Component documentation has been extended, updated or is not applicable
• 3️⃣ Backport to next requested with a Vue 3 upgrade

[ChristophWurst]

Looks good