Add the selected contacts to a group

[MrPompom]

Linked to the pull request https://github.com/nextcloud/contacts/pull/2756#issue-1246324202

By using the menu of the selected contacts.

Add selected contacts in a group who already exist

When the multiselect is clicked, it will display all the group which already exists and by clicking on a group, it will add all the selected contacts to this group

Create a group and add the selected contacts

It's the same but when typing the name of the new group and press down the return key, it will create a group of this name and add the selected contacts into it

[codecov[bot]]

Codecov Report

Base: 67.96% // Head: 67.96% // No change to project coverage :thumbsup:

Coverage data is based on head (4d49713) compared to base (e32f12d). Patch has no changes to coverable lines.

:exclamation: Current head 4d49713 differs from pull request most recent head 15e64b5. Consider uploading reports for the commit 15e64b5 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #2763   +/-   ##
=========================================
  Coverage     67.96%   67.96%           
  Complexity      253      253           
=========================================
  Files            23       23           
  Lines           721      721           
=========================================
  Hits            490      490           
  Misses          231      231           

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[szaimen]

I just rebased this. Hopefully I didn't break anything while doing so.

[szaimen]

@ChristophWurst I fixed the imports :)