Transfer deleted contacts to wastebin.

[RokeJulianLockhart]

Checklist

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Feature description

Transfer deleted contacts to the wastebin.

Why do you want this feature?

So that this action can be reversed in cases like #116 (comment).

Additional information

Wouldn't necessarily be necessary for me if a deletion action would work with nextcloud/server#1662 (comment), but that isn't true for every server.