Contacts: add support for VCF v4 import/export

Description

Support for VCF V4 was missing in our contacts app

Screenshots

Technical details

Added support to import/export VCF V4.

Tests

• Make a build with FEATURE_BRANCH set for any device:

  • FEATURE_BRANCH: 5674-r-vcf4

• Try importing these file in older build and newer one

vcf3.vcf

vcf4.vcf

• Try exporting in vCard in VCF 2.1/3.0/4.0

Issues

• e/backlog#5674 (closed)
• e/backlog#6155 (closed)
• e/backlog#5480 (closed)

10 commandments of code reviews

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