Cards NavModel

[zsoltk]

Description

• Creates a :samples:common module to share images / colors / resources / etc.
• Adds profile images
• Extracts common profile-related classes and composables
• Adds Cards NavModel to navmodel-samples
• Makes both Cards and AdvancedSpotlight use the common profile-related images and classes
• Adds a CardsExampleNode demo to sandbox

Check list

• [ ] I have updated CHANGELOG.md if required.
• [ ] I have updated documentation if required.