Allow selecting contacts in import dialog

[bedhub]

As an user, I want to be able to select which contacts will be imported on the final dialog inside contacts import and vCard import

AC

• There's a checkbox on the Import Contact Dialog to select or unselect a contact from being imported
• All contacts are selected by default

Test Notes

• On web and desktop:
  • All contacts start selected
  • Importing a single vcard file from the file picker works:
    • with all contacts selected
    • with some contacts selected
    • with no contacts shows an error and prevents the user from proceeding
  • Importing multiple vcard files from the file picker works:
    • with all contacts selected
    • with some contacts selected
    • with no contacts shows an error and prevents the user from proceeding
• On mobile:
  • All contacts start selected
  • Importing the contacts from the device works:
    • with all contacts selected
    • with some contacts selected
    • with no contacts shows an error and prevents the user from proceeding

[murilopereirame]

There's no checkbox when the layout is Single Column